Early B body 8 3/4 backing plates, etc

Soooomeday I’ll need to get my rear end on the BBP train. My pal has a yard full of 63-65 B bodies and parts. Including early 8 3/4 axles with the dreaded gland nut. My question is like so:
Are the shock plates, backing plates, drums, hardware, etc from the early B body housings compatible with a later 8 3/4 housing and the parking brake cables on my 65 Barracuda? If so this might be my way into horse trading other rusty junk and keeping the cost down.