1. This thread is over 4 years old man.
2. Im not sure I follow. I would get your domes cut so that your dont have to run a spacer plate. They are gheto and the're another place for a possible air leak. Check your squish and compression before you run it. Do you even need race gas? Was it ported for the 4 Mill or was it ported for the stock crank? Ditch the 2 in 1 carb set up. Get 2 PWK 35's or 33's.
421 Ported Serval, PWK 35 carbs, WCR promod tranny, F.A.S.T. Clutch, Noss Head custom domes , VF3 Reeds, Nology Coil w/ Hotwires,Shearer Inframes, +4 Stellar Swingarm, Leger A Arms Elka's, Lots more.