Upper control arms and ball joints are the same for disks and 10" drums (9" too I think) pre-1973. Problem is the Kelsey-Hayes parts are getting rare and expensive. You need spindles, lower ball joints, calipers, rotors, and dust shields. The latter is hardest, though not essential. On the upside, rotors used to be hard, but are currently cheap from Centric. I got 2 for ~$26 ea as a plan to try a roll-my-own disk setup, if I don't go K-H. Also, Mustang's used a similar setup so some parts interchange I recall.
For not much more, you can get the Wilwood conversion, which has light aluminum calipers and works with your existing spindles and ball joints. The most affordable is Scarebird's, though only for 9" drum spindles I recall.