Wylie, I don't think you need to worry about a frame graft or even swapping control armsUnless you want to upgrade to the full on 4000# front end.
Most 3/4 ton pickups use the LD front end and most if not all are 8 lug. From what I know, you should be able to find one and just grab the knuckles/spindles and brakes and swap them right to your truck. I'd stick to a pre 78 donor just because I'm not sure of what/why the steering was changed then. Just pop the ball joint studs and tie rod studs and grab what falls on your toes.
Red, do you know if any of those steering arm numbers are supercessions of previous ones? Or do your catalogs not have that info?
