John,
Chevy used a Rochester 4GC (4-jet)in that era (55-59). The problem is that the car restorers have just about dried up the supply of 4 jets & WCFB's for stock applications. I have seen them in the Classic Chevy Magazine for up to $500. It might be easier to find an aftermarket aluminum manifold and a Carter AFB, Elelbrock, or Holly carb(Preferably under 500CFM). Probably less expensive also. Fred
