Dear Paul;
That won't work on his application as he has an hydrulic clutch. On those, the master is the same unit with 2 cylinders side by side.
The one your speaking of in tandem with one in front of the other. One with the residual valve (rear drum brakes)& one W/O for the disc.
A 1962 C-10 has an outstanding braking system & best left alone unless a lot of weight is added etc.
JM.....
