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I know of the substantial development time Scott spent on this manifold. He wrung every horsepower possible out of it. Its a true high rise manifold. Its also a true dual plane manifold, the plenum divider is not cut down like the plenum divider of the Edelbrock RPM air gap manifold. I consider that a BIG advantage. Scott tried several configurations of reduced plenum divider, they all sacrificed low rpm performance. The runners are about 3 square inches cross section, which is about where they should be. That's a little bit bigger than the runners of the Edelbrock performer intake manifold. Flow consistency is very good as well.
I would love to see a real apples to apples (back to back) comparison of this manifold vs the Blue Thunder manifold, on an engine equipped with iron 4V heads.
Since it has no exhaust heat, use a carburetor with annular boosters.
-G