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.

you should have everything, i did this but my donor was a 73 scamp with 10 in drum instead of the stock 9'', i bent it drifting an intersection and getting greedy, but it was simple it should drop right in, like the others said, while your there replace everything, i did everything minus the shocks for about 300-350? get ready to fight with the torsion bars and make sure they're straight, what i suggest is get it level as possible (not on a drive way like we did) unbolt, lift the k with a jack loosen the torsion bars and pull towards the front or else you get pressure on the bars and you aint going nowhere.. its just 4 big bolts n torsion mainly. i do remember making this tool that saved me and my dads butts.. if you want to be extra motivated about it, degrease everything including the tranny tunnel i shot mine with some spray on lining, over all its not that bad have fun! n don't forget to get it aligned obviously. i read many drag people preferred the slant6 k due too weight, on shumacher.com they have instructions and these motor mounts that weld into the /6 k to turn it into a B.B. I'm dropping a 383 in mine. hope this helped.