Front/rear balance after front disc swap

My son's '65 Cuda with the 73 and later front discs and 11x2.5" rear drums was brake torque heavy on the rear. (Sorry, I don't know the rear WC diameter.) The PO had installed an adjustable valve in the rear line but had it waaaaay too soft in the rear. We adjusted it to be better )More rear brake torque) and there was still some rear brake reduction set in the prop valve. So with your smaller 10" drums, you may not need much rear brake reduction; I would try your combo without the rear prop valve first; find some level gravel area and try braking with various pedal pressures; the gravel will make it very easy to tell which end is locking first.

We recently installed EBC YellowStuff pads up front with their higher coeffiicient of friction to further increase front brake torque, so as to get out more of the prop valve rear brake reduction adjusted out; lots of racing time (rally) makes me much prefer to get the F/R brake balance correct with CoF selection over using any prop valve. Using a lot of prop valve for rear brake torque reduction will result in the brake balance being right only in a narrow pedal pressure range; it will be out of balance F-to-R at higher and lower pedal pressures. (This is simply due to how the prop valves work....they tend to be a compromise adjustment.)

The higher CoF pads up front really make the braking action a dream on this car now. We have pretty much all of the rear prop valve adjusted out (waiting for good weather to do final checks); the F/R braking balance is much better over all pedal pressures.