The parts I gathered that I didn't mention earlier include:
- NAPA part M36280 new master cylinder for manual brakes with deep pushrod hole, 1-1/8 bore, and larger reservoir in front for the front brakes. Much research in this other thread: http://67-72chevytrucks.com/vboard/s...71#post8762671
- A used 71-72 combination valve (proportioning valve) which I sent to White Post Restorations to rebuild. https://whitepost.com/brake-sleeving...ding-services/
Both are painted, so perhaps they will stay looking good for a while. The brakes have a nice feel. They are more responsive and take less pedal effort than the 1969 all-drum setup. I am glad I went with manual brakes.