good that you have the rear & front drive shaft pins covered (see other thread)
certainly check or rebuild diff case.
spares to have from day 1 - i can only think of front arms & hinge pins.
brass weights, side pods, sway bars - imho, they are tuning aids that are not required from day 1 but can make your life easier once you get used to the car.
if i were you, i would just get the few things checked and then start running the car PRONTO!
. get a feel of the car, find out what you like & don't like in the context of your local track surface & layout. ONLY THEN, look at the tuning aids ...