Hey I am gonna convert the rear to disc, My question is what master cylinder should i run ? Mine is now leaking and i need to change it. A friend of mine suggested one from a 70's Vette cause those had 4 wheel disc. Any thoughts ? Also will i still need a proportioning valve ? And do i need to change my metering block on the frame ? Any input would be great ! I plan on piecing it all together with the speedway brackets and such , so i can save a few bucks !