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 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

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

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)

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)