in reading thru these posts i thought to have seen where yoy can run the stock front disk /rear drum setup(master/prop valve/dist block) with rear disc brake conversion if you added a adjustable prop valve to the rear brake line. now i can't find the post .is this possible??? it would save me running a new prop valve, removing the dist block and redoing all the brake lines. thoughts???

There is already a prop valve (http://inlinetube.com/Prop%20Valves/PR104d.htm) on a 70 chevelle. The dist block (http://inlinetube.com/Prop%20Valves/PR-107.htm) is 50/50 and you have a metering valve (http://inlinetube.com/Prop%20Valves/PR-115.htm) on the front line; I'd say you're all set for a 4-wheel disc set-up.

Whatever you do, do not put 2 prop valve in series; it could do unexpected things in certain situations.