W/r/t Indy ModMan and the Edelbrock/Chrysler aluminum 6bbl intake
Those are very different.
The Eddy is a 180° dual plane type, and restrictive as to CFM available per cylinder to 3 bbls.: each intake port in turn only draws from 1 side of the manifold. I also just found some reviews about how complex re-jetting is with major engine mods.
The ModMan is an open shoebox; a tunnel ram with very short runners and a smaller plenum.