I just went around with CPP on that pedal issue. You CAN pull that one off and used your original pedal. You have to take eliminate the gap in the side play and make a small extension to reach the hyme joint for the booster rod. I'll have a video up soon.
It's a 4 disc set-up, so you need the residual valves to keep the shoes out near the drums. Just place them in line right out of the master cylinder. Drum brakes retain 8lbs pressure to overcome the return springs. Discs have no residual because it relies on rotor runout to move the pads back. You'll also want to eliminate the proportioning valve.
