More HP on 273 Stock 63 Dart GT Vert?

Thanks, Grim . . . the parts numbers are so helpful, better than general advice. Cataloging those numbers in my notes now . . .

A dual quad manifold? Now, that number would be gold . . . I would be willing to invest some time and patience in finding that!!!!
Rumblefish360, one of the mods on here had one for sale . Not sure if he still has it.