Help with the K member!

I'm sorry if im in the wrong place, but i have a 1973 Plymouth duster, and a 1974 Plymouth duster k frame.(because it has the disk brakes and power steering) i am currently trying to do an engine swap and k frame swap to the 1973 duster. Full story is that we bought an old 73 duster and it had a slant 6 in it. runs great, but we wanted a project. We bought a bigger moter (318) and had it rebuilt. We decided that we needed Dick brakes in the front as well as power steering. Someone was selling an old beat up 74 duster that we bought just for parts. Luckly the K frame was good. So what we need to do now is take the old k frame and engine and tranny out of the 73, then put the 74's k frame in with the new engine mounted and hook it all up. i am not sure on how to do this or what parts i need or where to get the parts. I am doing this with my father as a project. I'm sure he knows more about what to do but i am tasked with finding the parts.

Short version: I need to know what parts i need to mount a 1974 duster's K frame to my 1973 duster. i also need to know how to go about this, and where to get rotors, pads, bushings, and the mounting hardware.