On my '48 1.5 ton, I used a master from a '66 Pontiac Catalina. It was designed for non-power, 4 wheel drum brakes without a proportioning valve. If your brakes are properly adjusted, you shouldn't use much fluid from the reservior. Besides, dual res. masters hold more fluid than the originals did. I did incorporate a booster into my system (from a '75 GMC truck). You need to fabricate a mounting bracket though.
That's what I did, Scott
