I did as the manual suggested and modified a Mustang II brake pedal assy. And after trying a power brake master cylinder, I didn't like the limited space to try to remove it if replacement was needed. I also changed the rear brakes to disc so went to a manual Wilwood mc. The pedal goes about 4-5" before it feels like its working. I called Wilwood and followed their suggestions and then bought a brake pressure gauge.pressure starts to build @ 4" and I can get as high as 800-1000 psi but it takes a lot of pressure. I found the pedal has a 4:1 ratio which points to the cluster came out of a power brake car. I've run all stainless steel lines and polished the so don't really want to replumb. Any suggestions? With 11" discs in front and 10 1/2" discs on back is this going to be sufficient?