Question/advise about parts?

I own a 1970 Dodge Dart swinger, It was a /6 and I'm now slowly turning it in to a v8 car and I just need a little guidance from you all. I've purchased a donor 1975 dart 4 door custom with blown up v8 but all the parts I need to make mine a v8 with disc brakes. Everything should swap out from one to the other right? If not what road blocks may I run into?.... I'm pulling complete front suspension and k member out and steering box and pump. Do I need the column or will the original one be fine.?. Also brake line master cylinder the proportion valve for brakes.?.