67 c10 drum to disc

[sos1967c10]

Hello all. I'm currently restoring a 67 c10. I'm at the point where the frame is bare and I want to upgrade my front drums to discs. I have talked to a few people and got 2 different stories.
1) I must purchase a front end from a 72 or older including crossmember, tie rods spindles etc. Bolt off my whole set up and bolt on the new set up.
2) I can just purchase spindles callipers new 6 lug discs and bolts those on, with new ball joints and hoses obviuosly.

I'm not sure which one is correct. I would prefer to just take off the spindles but is it necisary to change the controll arms and the crossmember as well? I fully intend to change all joints regardless but I only want to do it once.
If I have to change the whole front end will the free front end off of my buddies 83 1/2 ton bolt on or do I have to stick to 72 and later?
Any advice will be greatly appreciated!
Shawn.