just as a fact check, any A-body 8 3/4 is a direct bolt in up to 1972 correct? I got the idea the OP was specifically looking for an early a-body 8 3/4...
Correct, a few minor changes, like brake hardware and vent location. No big deal. In the long run, if running the SBP, bite the bullet and just swap in the A-Body 8 3/4 and be done.
