Swapping Rearends need brake help

so i'm pretty new to this mopar stuff, and i have my 70 duster with a 7 1/4 rear end and i have another one(1974) that i want to swap in because it has the larger bolt pattern. I was just wondering if there are any precautions i should make in order to change it out.

however the one question i really want answered is when i switch out the rear end is it hard to reconnect the rear brakes?

if theres another post already i would appreciate the link