@Jon_S,
Here is a voice from the other side. Swap the crossmember! Your plusses are; NEWER Parts. Chevy/GM continued to upgrade throughout the life of the design. This means larger tie rods, ball joints, and tie rod ends. Also the A arm bushings are rubber. Any competent front end shop can align your truck. If your frame doesn't have the clearance bulge for the power steering box, (I think it does but I could be wrong,) there is a member of "The 'Bolt" who makes a spacer. I've done a couple now, and for me, it's a one day job. I do replace all the tie rod ends, joints, and bushings. Why run this steering stuff used if you don't have to? Another plus is you don't have to remember what you adapted to what! Makes it easier in the long run.
I also like your idea of getting a whole truck. You can pull the rear axles and have 5 lug all the way around. Another easy swap.
What ever you decide, take your time and do it right! Your and the lives of your passengers and those around depend on the quality of YOUR work!
best wishes,
Les
