Brakes ?

[OL BLUE]

im sure this is a repost but, when i start on my truck id like to add disc brakes. i dont wanna spend big bux on aftermarket stuff. i just wanna know what fits from other years trucks or whatever i can find at the boneyard. ive got a 67 c20. i know some of the 71-72s had discs but they are gettin hard to find in salvage yards. will 73-up parts work? what years and what all will i have to pull from the donor truck? thanks in advance for any help you can offer.