I was thinking something in the lines of the old Edelbrock Streetmaster manifold. It was a low rise single plane short runner shit manifold that when coupled with a Paxton SC would move more air than any setup Paxton tried. I used this setup on my Cobra kit car and made insane power. I was running under 10 psi but it felt like more.
I known that tey were looking at something similar though we ran into the same problem, the air delivery to the ports was uniform. A street application might not notice it but as these were built strictly for racing only they figured "why compromise?". As to how they fit under the hood here's a pic I found. Credit to Micky for taking the picture of his truck: