The 65-66 disc brakes were excellent, I have run mine in autocross competition. If you can't lock all four wheels, something is very wrong.
If the proportioning valve is jammed due to being full of old crud, it can be rebuilt. A jammed valve would result in the same pressure being supplied to all four brakes. Since the discs require far higher pressure than the drums, this would result in being able to lock the rear wheels but not the fronts, resulting in really crappy braking, since the smaller rear drums, not the discs, would be doing all the work.
I like to test the brakes on a gravel road. Really easy tell which ones are working and which are not, just stop using increasing pedal pressure until a wheel locks. This is also the best way to tell if the proportioning valve is working properly. The fronts should lock before the rears. Since the 65-66 factory valve is adjustable, this is something to look for.
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