Probably look at similar builds for ballpark. Your camshaft will play a huge role in boost also. The 114 degree split will help your boost. If there is too much overlap, which increases with duration and closer lobe separation, the supercharger will just be blowing out the exhaust. The more your heads flow, the more your exhaust flows and basically anything that increases volumetric efficiency will yield lower boost pressures.
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Chris
1969 Firebird: injected Pontiac 462ci, T56
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