What to use?

[69protour]

What to use? I've been researching which master cylinder to use and I'm at a dead end. I've got the Wilwood 12.3", 4 piston system front and rear. The camaro was a manual brake setup to begin with. So I called Wilwood and they said the new manual master cylinder that is a 1" bore and is already proportioned to 69%-31% will work fine on the car, with a prop. valve on the back just to fine tune it. Now the only thing is that the master cylinder is $200.00 alone. Now I found a master cylinder from Touring Classics with a 1" bore from a 67 to 76 corvette for $85.00. Could I use the same proportioning block off the car or go with one off an early 4 wheel disc corvette, and also add a prop. valve on the rear also to fine tune them? Thanks guys. Trond