A-body Disc brakes

It seems the more questions I ask, the more answers I get which makes for more questions!

Wow, that didn't even make sense.

Anyways, I have another question, I read above that I needed the upper a arms from a 73-75 a body, so my next question is, would the parts out of a 76 Duster work? I found a 76 fairly cheap and was wondering if the rear end, and disc brakes would work on my 1966 Barracuda?

Thanks for any input!

John