if they interchange with a normal 2wd truck you can just use the rotors from a newer truck in the 70's along with the spindles and you will have disc brakes
I would love to find out what it would take to put disc's on the front. Would definitely be a nice upgrade. At this point tho I really just need to put a hub on it. I need to make it driveable and then move on to upgrades lol.