I want to put an edelbrock manifold on my 318 with a stock 2 barrel on a 1985 w-150. I want to use the edelbrock performer manifold with a edelbrock 600 cfm 4 barrel. Do I need to change out the cam to run this carb? Just wondering because I know its a pretty big job. Is there any other manifold and carb combinations I can go with? I plan on ordering the parts from summit.