[Daves55Sedan]

If you do keep the 239 V8 truck engine, it SHOULD have the original ECG-9425-B intake manifold on it. The car 239's had a smaller intake and matching heads that are not readily interchangeable with the truck 239 intake and heads.
If it has the 9425-B, you can use any of the 3-bolt carbs of the era. All have the same bolt pattern. The Ford EBU has 1 inch venturi's. The Holley 2100 has 1-1/16 venturi's.
As KULTULZ has indicated above, these carbs can be MODIFIED to work with a mechanical advance distributor if you want to go with a '57 and later mechanical advance distributor.
Please verify which engine you have first. The 239 truck engine was similar to the '55 272 engine with many interchangeable parts between the two.
Also search the archives on this site to study the differences between the '55 truck 239 and the '55 car 272 engines. This will help with parts interchangeability