If you're swapping to a big bolt pattern and swapping spindles, you'll also need upper contol arms from a big bolt pattern car, otherwise, the big ball joint won't fit.
At a minimum, inspect control rods. If not bent or threads stripped, I'd feel safe to re-use. Same for adjustment sleeves. Replace any joint with a split or missing boot. Those that have good boots, inspect for wear. If worn, replace.
Check lower ball joint for wear. When checking, be sure wheel bearings are secured properly, otherwise you'll get a false indication when pulling on the tire.
As long as everything is apart, change the bushings. They are a pain in the butt to change, but not expensive. Go to rubber or poly as you like. This makes a surprising improvement in steering precision.