This website has always saved my butt in numerous occasions regarding issues with my 1984 z28 and hopefully can do the same again. I just finished putting a complete (fr & rr) brake kit on my car, but I'm now desperately needing to know if my stock (front discs,rear drums) master cylinder and proportion valve can safely be used on the new 4 wheel disc upgrade? I'm confused with some of the other threads, and so far I'm thinking maybe all I need is a new proportion valve, then again maybe my stock setup is the way to go. Any help with this problem would be greatly appreciated.

Thanks in advance,
Carlos