I've always wondered about a carburetor versus heads for a better air flow. Now we all know that a goal for a carburetor is to mix the right amount of gas with air so the engine runs properly.Not enough fuel mixed with the air, the engine runs lean. and to much fuel mixed with the air and the engine runs rich. Now for and example I will tke my 305 engine. It's been bored .060 over with a mild cam, dual plane intake witha a 600 cfm carb. Compression is 9:2. This engine runs with slightly ported heads done by myself and I know that the engine is running out of air at around 4500 RPM's. My question is I know I would gain alot of both torque and HP with newer heads, but what would happen if I increased the carb from 600 cfm to 700 or 800 cfm? The carb would draw more air and that's what this enigne needs. On the other side, it will draw to much fuel and run rich. Now if I cut back on the jets wouldn't this solve the air problem(although it probably might not be enough to make a difference)? Just some thought on the matter.