I've used the CPP front disc conversion with corvette disc/drum master, 2 & 10 pound residual valves and a Wilwood adjustable prop valve on several vehicles. Never ran into a 1/4" rear line. The little adaptors for the residual valves are only for 3/16th lines.
The Wilwood adjustable prop valve goes behind the 10 pound residual valve in the rear circuit. (Master cylinder to residual valve, then adj prop valve.)DO NOT use your stock prop. valve with the adjustable valve. Normally, 2 turns from fully closed on the adjustable prop. valve is a good place to start tuning your rear brake bias. There is some good info at the following sites:
http://www.ecihotrodbrakes.com http://www.mpbrakes.com http://classicperform.com Be careful with the little threaded adaptors for the residual valves....they are not just something you can pick up locally. You may have to run some new 3/16 line to the rear. Hope this helps.
Dave
