[PGSigns]

Been working on cars for 40 years. Have seen a few. Just look at the lowers in your pictures. One smooth side and one spline side where it goes through the control arm. On the uppers look at how much tread comes through. No matter what else you do consider the duel resavoir master cylinder upgrade and splitting the brake system from the single line. Bad things happen when you have an issue. I wrecked the 64 when it sprung a leak and all the sudden had zero brakes. I have a 65 with the disc brake upgrade with a complete front from a 83 doner under it and also a 66 with the factory drum brakes and the upgraded master cylinder in it. So I have done it both ways. Both work well. I your first post you said you don't know much about brakes and this is a part of the truck that MUST be done right. Find some qualified help and take time to do this right no matter what path you go down.
Jimmy