A-body BB 4 speed / Bell Housing?

My project is a 70 Dart with 383 & A833 4 speed. Looking for the 4.35 IBR housing and see a lot from E & B bodies. Would it be better to find an A-body bell housing? Are the pivot ball holes in the housings in different places across the A, B, and E bodies? Or, is the Z-bar fab work going to be the same no matter what housing I find? Seems the A-body bell housings (BB) are harder to find. Occasionally seem them from a 68/69 BB dart gts but they are pricey.

Appreciate any help/thoughts.

D.