[69 1/2 Sixpack Bee]

I **think** I read somewhere here that '73-'87 trucks' disc brake spindles and lower control arms bolt right up to our era trucks, right? My nephew wants to put discs on his '70 GMC and the later model trucks are much more plentiful around these parts. Will these parts bolt up? How about the booster, master and prop. valve too?

Thanx,
Bud