I'd leave the 4bbl alone and get 3 Rochester 1bbl's, using a offenhauser 3 carb intake, and go to www.stoveboltengineco.com and get a set of his tubular headders. reason I say this is, the 2 end cylinders on these 6's tend to run lean due to the fact they use exhaust gas to heat the intakes, which leaves droplets by the end cylinders, the 3 1's will give the end cylinders what they need. you will save a few bucks also. you could also drop about 1k on a 235 blower manifold ( no longer made ) and put a 4/71 blower on it, if you wanted extreme power from that 235.