[blykins]

I received your email and tried replying 5-6 times, but it instantly comes back to me.

My first question is are you running power brakes, or do you need manifold vacuum for anything? Second question is, where would you want the peak hp rpm to be? 5500 peak with a 6000 shift point?

To answer some of other points made here, the Air Gap is exactly the intake that I would use for this engine. It will support over 550 hp on a 418W and will pull to 6500 easily. You will find that the dual plane intakes will overlap the single plane intakes quite a bit. It's only when you get into some very large displacements (427-up) or higher rpms that they're warranted.