4bbl Carb questions
The Super Six carb is the Carter BBD-81375. You can use this with the Super Six kickdown linkage with no alteration.
Mopar used to make an aluminum manifold, P4529115. I don't know if it's still in the system. It will work with either a Holley 2300 or the Carter BBD.
I echo BillGrissom's, and others, suggestion of looking over at SlantSix.Org. Lots of good stuff.