Yes, I will probably list the rotors and calipers in the classifieds once I UNconvert back to drum brakes that are (especially if power boosted) entirely adequate for the street. Unfortunately I probably won't have it done in time for someone who needs them on their Impala before the 12 hours at Sebring ...but maybe in time for the Glenn. Riiight.
I spent more that a few seasons racing an SCCA D prod. Yenko Stinger that had drum brakes with metallic linings and they were wholly adequate. Sure, they could get hot and lose a bit of bite, but I don't see that being much of a problem with this '64 Impala.
...and Chris, thanks for the info. I've already checked on those parts. Really all I need is the backing plates and hubs(to take new bearings and seals) since I'll be getting new everything else (shoes, springs, wheel cylinders, retainers, and hoses) and probably new un-turned drums. I think that the adjustable proportioning valve will probably work out fine since it is adjustable.
Maybe you or Big Dave can help me out with that. Seems to me that the original master cylinder supplied equal pressure to both the front and rear brakes, the front brakes being larger than the rear.
Thanks for your input.