Which Carb Gives a Balance of Power & MPG?

It's hard to describe about the plenum. You have to see it. The plenum is completely open on both sides all the way from the front to the rear of the manifold. It is described as a high rise manifold on every retail site and on Offenhauser's site. It's simply not as tall runner wise, because it's a single plane. It is a different type single plane. But I completely understand your point. I've run these in the past and they will out pull just about everything in their class. I have run several on different applications. Have you ever run one?