65 Barracuda Brakes... Help

You can get some redrilled axles from Dr.Diff and others. They are out there you just have to do some digging. For rear brakes just dig through some junkyards and find an 8 3/4 equipped anything other than an A-body. My rear brakes and backing plates came from a 68 D100 pickup.....

why anything other than an A-Body?

I found a guy selling a whole A-body rear end set up for a 74 dart, would it work?