I installed a front suspension from an 83 GMC half ton under the frame of a 1950 Chevy pick up and used the rear axle from the same vehicle with drum brakes.
So had front disc and rear drums both from the 83 GMC. Then mounted an aftermarket power brake system with a dual outlet master cylinder under the floor in the stock location.
I did use proportioning valves for front and rear.
At first the pedal would almost hit the floor before it would stop the truck, and it would lock the tires up, but had to travel a long ways down before it would stop.
I finally found the adjustment between the master cylinder and booster was spaced way apart and after some adjustments we made the pedal didn't have to travel far and you had plenty of stopping power.
