I am putting disc brakes on my 67 camaro. Can any one tell me the best master cylinder to use. I heard once to use a 71 corvette master cylinder. They will be manual disc brakes. Can you also tell me if I can use the proportional valve from a 76 firebird or should I just plum the fronts brakes direct and use an adjustable valve on the rears? Lots of questions but you input will be very helful. Thanks!