Balljoints or Control arms

[Hank70SS]

Uppers are the easiest, and obviously the cheapest. I would start there too, may be enough improvement for you. If not you can always do the lowers later.

You're limited on alignment with stock arms, that's where new control arms can help. Still you should be able to improve on the original specs designed for bias ply tires. Try to get -1/4* camber first. Then as much positive caster as you can with out affecting camber, may be able to get up +3* on caster with stock arms. Then 1/8" toe in.

If you have frame sag, not uncommon after having a big block sitting in there for 40 years, you may not be able to achieve the above specs. They make offset cross shafts for the upper arms that will compensate for the frame sag.