71 Duster Disc brake swap??

Hello all, I need some information on the disc brake swap on a 71 Duster.
The donor car is a 1974 Dart Sport. Is it just as simple as replacing everything up there? Will everything swap straight over or do I need anything specific kept off the Duster? Basically my plan was to just remove everything from the A arms out, and bolt them up to the Duster. Is there anything I need to know about or is it just a straight up swap? Im planning on getting started on this today, so any good information you have ASAP would be greatly appreciated.

Thanks again.

Also, when swapping a rear end from 7 1/4 to 8 1/4 should it be a straight up bolt in situation? The donor is the same 74 Dart sport.