The main thing on '68 and up to wear out are the ball joints. A pain to replace. I went with complete reconditioned torsion arms with ball joints already pressed in. 20 bucks each (German ball joints) at
www.kustom1warehouse.com. Nearly as cheap as the ball joints alone and the charge for pressing them in and out.
You may also find the torsion leaves broken. About 1/3 of the older Bugs running around have a leaf or 2 broken.
Another front end part that should be looked at are the needle bearings for the torsion arms. Also a pain to replace. If they are good, make sure you get new seals. If they're bad, I recommend replacing them with urethane bushings, which don't require seals.