72 disc brakes on 71

I came across a 72 duster at the local self serve salvage yard with disc brakes on it. I have a 71 demon 340 with manual drum brakes on it. I would like to eventually convert my car over to a manual disc set up. The 72 Duster has power discs on it. My question is what parts do I need to pull off the donor car and is it worth it vs buying a new conversion set up.I can get all the parts for around a $100. Keep in mind I want to keep the original small bolt pattern rally wheels.