A 4 BBL on a stovebolt is an answer to a nonexistent question. The engine can't flow enough CFM through the restrictive intake and cylinder head ports to make the 4 BBL necessary, or desirable. It would be like putting a single 1/2" link in a 1/4" chain. Unless the air filter, carb, intake, ports, camshaft, valves, exhaust manifold, and pipes are engineered to work together, putting a high-flow carb and exhaust on an otherwise stock engine is just eye candy.
Jerry
