Clutch Pedal & Power Booster

[Rich1972C20]

Need help on to two problems.

My clutch pedal doesn't return. I bought a new pedal return spring but it didn't fix the problem. It will return if I don't extent the pedal all the way. Any suggestions on a fix?


My other question is I put in a power booster with its master cylinder from my '72 C10 into my 67 C10. The 67 has drum brakes in the front. Can I reuse the original proportioning valve for the 4 wheel drum brake system with the power booster?

Thanks