Thinking of converting to Manual Brakes

I have a 71 Scamp, with power brakes and Im thinking of converting over to manual brakes. Has anyone ever done this? What all is needed? Can I keep the stock proportioning valve?

By the looks of it the stock reservoir should bolt into place but not sure about the way the brake pedal would work out along with the push rod and such.

Im wanting to clean up the engine bay and make the car lighter for racing. Thanks ahead of time for the help