1967 F100 came with all wheel drum brakes. It works, but not the way I would like it to. So the answer is to find a donor 73-79 F100-F150 and take the disc brakes from it and transplant. I found a Craigslist ad for just what I needed. The cost was $300, and then the new parts I need to make it safe.
So for $300 I got the radius arms, beams, spindles, and calipers. There was no proportioning valve, master cylinder, or brake booster. I ended up sourcing those items from O'Rielly's around the corner from me.