My plugs are fouling up bad and have been told its carby problems. I know this is gonna be hard to answer but would like some ideas. I have a 750vc Holley with a Proform main body, Preformer airgap manifold, fuelie heads which are flowed and have big valves, 9.6:1 comp, an Extreme energy XE274H cam 0.49 lift, flat top pistons. any idea what jetting and powervalve I should be using? Not sure whats in there at the moment yet until I pull it apart.