318 4bbl questions

So I have a stock 74 318 2bbl With dual exhaust. I want to put a 4bbl on it. I have a edlebrock street master 318 aluminum manifold and i'm trying to decide on the carb. I was thinking the 500 cfm edelbrock performer carb. Any other thoughts? will this do more harm than good because the rest of the motor is stock? Will I get anything out of this swap at all?