If anyone is looking for some gears for an 8 3/4, as of 3:00 on 4/16 there is a 1972 D10 with an 8 3/4 rear with (according to the tag) 3.23 open gears. Large U joint. I think they get $75 + BS fees + tax
Check for non tapered axles. They can be shortened and resplined for an A body. You could make some money getting that rear. Shock plates and all. Nice find.