The majority of car owners who have either a built or stock motor, seem to use a 600 CFM carb. Since chevy engines run from 265-504 and larger, Fords from 239-427 and larger and mopars from 273-426 and larger, I am curious what other CLH members use in relation to the engine size. For example, I have a 305 chevy engine bored .060 over to 315 CI, and I use a 600 CFM carb.