Spindles aren't really needed, you will need king pins and bushings though if they didn't press in new bushings already. You might also need the pivot bushings. New springs are probably a good idea, I'm pretty sure those beams work with stock height springs.
They could probably give better answers in the 73-79 forum though.
Thanx,I was wondering if they were just trying to sell me spindals I am planning to do all new bushings sence i'm there ya no? Think I should get coils from belltech as well? O'yeah I'm still getting use to WAFTE forum so hang in there with me,I'll get it someday