I had a 305 SBC built with a comp cam and 2.02 valves in the heads. I installed a new 3x2 rochester setup that has progressive linkage. Also have a MSD ignition with the middle carb vacumn line hooked up to the distributor. It is installed in a 32 Tudor with 350 transmission. It runs ok but doesn't have a lot of power and the plugs are black. Not sure what jets are installed. Anybody have any ideas?