Somehow, I don't see my reply on here.  Anyhow, I had one made up for my 54 Merc from Classic Tube from Lancaster,NY. It was excellent & pretty reasonable.Google it  & they have a big website.

I like the Summit carb. I'm no expert but after a little reading I was able to get mine running good. They are fairly simple to tune and kits are available to tune the idle circuits and accelerator pump circuits. On a related note I found all the fittings I needed from Inline Tube except for the one that goes into the manifold. I ended up finding an original for that. I'll post pics after the installation.

Durham Missouri

Just a few months ago I ordered one from Classic Tube in Lancaster, NY for my 54 Merc..  It was reasonable and I was pleased.  Google it and it should come up...........

Ah, another Summit Carb on Yblock. Seems to be lots of guys using them now. 

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's

I've made my own tubing as well. I use brake line for that and I use a couple of good flaring and tube bending tools.



~DJ~ AKA "Bleach"
1956 Ford Fairlane Town Sedan 30K original miles

What you refer to as being 3/8” NPT X 7/16” inverted flare in reality should be 3/8 NPT X ¼” inverted flare.  Inverted flare fittings are based on the tubing size, not the nut size.
 
The Summit carb will require what’s called a 3/8” inverted flare on the 3/8” steel line.  I typically use 3/8” brake lines to make the fuel lines and reflare one end as deemed necessary once the correct length and curves have been determined.  Here's a picture of 3/8" brake line with an inverted flare fitting being used on a Summit carburetor.
 

Lorena, Texas (South of Waco)

Here is the link for inline tube.  They have the right one.  http://www.inlinetube.com/

I ended up getting a 57 T-bird line kit. Now I have another question for you guys. I have the fittings from the fuel pump to filter and filter to carb. I cannot find the 3/8" npt x 7/16 inverted flare 90 for the manifold vacuum line. I also need a 3/8"npt x 1/2-20 inverted flare to connect to my carb ( Summit 600 cfm). I've done numerous Internet searches and at the local auto parts stores. Does anyone have any ideas? I have not checked at NAPA yet but it's a small store so it doesn't hold much promise.

Durham Missouri

I made my own using a bender and flaring tool from HF. The fuel filter came from Ecklers and I don't like fuel rubber tubing and hose clamps much. The air cleaner covers a lot of the work up.

56 Vic, B'Ville 200 MPH Club Member, So Cal.

Thank you sir for the compliments . The exhaust manifolds are done with Eastwood Gray Hi-Temp coating ( rattle can) part # 10395.
That car has a D code 312 , it came from the factory with an 1850 style Holley 4bbl so the linkage rod was configured by Ford.
I imagine the only source for the throttle linkage is the used parts market , I have never seen reproductions.