Otto’s idea sounds like a good approach. On my 66 C10, I used the CCP front disc / rear drum / power booster kit. I used standard ride height, 6 lug & 11 “ rotors ( They clear 15” rims). The kit , as I recall, includes everything except the rear brake parts. Only modification I recall doing was I used the original push rod off the brake pedal & welded (brazed) to the CCP supplied rod to make length & slight offset work out. It was an easy mod.
