Any vehicles that I've put discs on the front, also got the combo valve from the donor vehicle. So, sure...install a combo valve. Assure that the BRAKE warning light on the dash works as it should. Metering (Holdoff) valve in-line with the front brakes, proportioning valve in-line with the rear brakes, and the safety switch in-between.
The next upgrade would be 11" drums from a newer intermediate car. Stay away from "Flat-Bracket" cheap-junk rear disc conversions.
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