Quote Originally Posted by firebird77clone View Post
Manifold vacuum is from the base of the carb or directly off the intake manifold. Ported means it's taken off the cab, above the butterflies, so you only get vacuum above idle.
Ah, right. All of the vacuum lines are hooked up below the carburetors, but above the supercharger. The carburetors are boost referenced, to a connection below the supercharger.