8 3/4 build questions

I have a complete 8 3/4 out of a 72 Charger that has a 489 center section. I am currently trying to work a deal to buy an A-body 8 3/4 housing. Will the drums and backing plates from the 72 B-body rear work on the A-body housing? Also I will need to buy axles. Would the stock (A body) length still work if I use the 72 Bbody brakes and backing plates????

Thanks in advance!! :thumleft: