My carb of  choice for the dual quads would be the Teapots.  They are small enough that over carburetion is not an issue and the true vacuum secondary design allows the throttle to be fully opened at low rpms without any major ‘gasping’ taking place.  It’s important though that the same year model Teapots be used as matching pairs and ideally using those Teapots that have very similar list numbers.  If simply wanting to use new carburetors or something that's readily available, then the 500 cfm Edelbrocks would be the next choice on the list.  I've tested the 625 cfm Street Demons on a couple of different Y dual quad engines and they are simply just too much carburetion for the small cubed Y engines set up in a daily driver format.

Lorena, Texas (South of Waco)

Milling unposted heads excessively gives the head gaskets the opportunity to fail simply due to the head decks being too thin to adequately support the head gasket.  The posted heads added internal supports within the water jackets so that the head gasket sealing ring would be tighter against the head.  Here’s the link to a past thread showing how to identify posted heads.

http://forums.y-blocksforever.com/FindPost47308.aspx 

Lorena, Texas (South of Waco)

You guys rule!  This is the stuff that dreams are made of.  In mapping out my y-block build, I have a number of things to consider.  First, I will use stock exhaust manifolds.  I have 2 sets of the 1957 large type.  The car currently has an air cooled Ford-o-matic, I'm looking into a c4 or an aod conversion.  Then there's air conditioning.  Even though the factory air unit doesn't use vacuum, I still want a stable idle with the air on.  About carburetion, I love the look of two Holley tea pots. I understand that the modern 4 barrel intake will out perform it by a long shot, but the appearance of the dual quads is priceless. Also, what happens to non posted heads?  Do they blow head gaskets or do they crack?  What makes it happen?  Is it static compression? Or is it high horsepower?
Alvin

Alvin;Welcome to the site. No shortage of technical expertise here. Sounds like you and I have similar rides and at least at the start of this post, you had a similar engine build in mind to my 56 Customline Victoria. I used dual Edlebrock  #1404 carbs on an Edlebrock  #257 with carb spacers that I port matched. I built this motor almost 10 years ago prior to the availability of a lot of the new performance parts you can get now. As Ted and others have said, probably not as well performing as one of John M's new aluminum intakes and aluminum heads, but pretty good performance with no issues at all. 

  Ron Lane,  Meridian, ID

Alvin here's a picture of my first "ride". I was 5 years old. The 1955 Ranchwagon was new. Tho not the same one I do have a '55 Ranchwagon today ~59 years later..

"The Master Cylinder"

Enjoying life at the beach in SOCAL

Alvin: Welcome here.. As you probably are becoming aware, there have been numorous "late " developments re our favorite engine. I think you'll find it very interesting.  Another reference you might want to consider is a subscription to Y-Block Magazine, now in it's 20th year. You can link from this sites opening page to it, and get an e address for further information.. You didn't mention what transmission that you're likely to use? If a Fordomatic, you might want to link to John Mummert's page also, where he lists several camshafts with recommendations re transmissions etc.. Have fun!  


Paul

Darn, I was just in Marksville at the Paragon resort and casino. I have worked with the Tunica Biloxi tribe for 20 years as a Pow Wow consultant. Would love to meet up sometime. There is a member here from Shreveport. Chuck

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Baton Rouge, Louisiana

First, where do you live? It helps to know for contacts. This site is riddled with guys that "love" Y-Blocks so its more like you've found your place. In the recent years the 500hp street Y-Block has become a reality thanks to a lot of work by members of the site and one or two old crusties that don't do "computer". Welcome home! Chuck

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Thanks guys for the warm welcome.  Let me know if you find it a little strange when I use the word love in conjunction with 56 Victorias and Y-blocks.  I'll tone it down a bit.  My passion for Fords started when I was a small child seated between my mom and dad in a 55 Ford station wagon.  That front seat view was priceless.  The wrap around windshield distorted images in the corners.  The Astra-dial speedometer showed everyone in the car how fast you were going.  When I was six years old, I told myself, One day, I'll own one of these.  That day came in 1979.  18 years old and first year of college,  I purchased the first of eight 56 Ford cars.  Fast forward 35 years.  I've put my two kids through college and for the first time in my adult life, it all about me.  Its time to fulfill the lifelong dream.  My horsepower goal will likely be limited by my tolerance for cam and converter.  This car must cruise the interstate at 70 mph.  It must run on 93 octane fuel and it must idle with air-conditioning.  These things will limit camshaft which will ultimately limit horsepower.  So far I have 3 complete engines with ECG-G heads and a 1957 dual quad intake.  The only thing that's "off the table", is aluminum heads.  The budget wont allow.  Everything else is up for consideration.  As I said before, I'm open for advise.  By the way, I have the early copy of the Y-block book.  Would the new SA Design book be helpful?
.