replacing master cylinder and prop valve after disc brake conversion

[mgchevyparts]

Your orig master will work. The Corvette will fit also. The difference is that with your drum master you will need to add fluid down the road as the pads wear, this is to keep the master from possibly running out due to small reservoirs. You can addthe GM non adjustable prop valve for 4 wheel disc or use an adjustable on the rear line. You may be OK without one also. You really only need one if your rear brakes lock up excessively before the front brakes. I would drive it, give the pads time to braek in and see how it performs, if the rears don't lock up before fronts I wouldn't bother with it. If they do then splice in the adjustable in the rear line and adjust to stop the rears from locking.