found a bag setup, what else do i need?

[70chevc10]

hey guys, i found someone selling a bag set up, it has 4 firestone 2600 bags, eight 250psi 1/2" vavles, compressor, two 3 gallon tanks, and toggle switches. for my 70 what would i need besides a super track bar, shock relocators, and brackets for the front bags? do i HAVE to get new shocks? or will i be able to use the ones i have ( i have a 2 inch drop right now) also, would i have to use drop spindles or can i get away without them? (im on a budget and cant quite afford to upgrade to discs just yet but if i do i have stock spindles). thanks for the help guys