Ok on my 53 1/2 ton 5 window I put aftermarket master cylinder brake booster combo on under cab original location. 350 small block, pedal is hitting spark plug wires and will hit headers if pedal travels far enough. Not sure how far pedal needs to go yet. I was thinking of shortening arm by about an inch to correct. Then move hole in floor down to meet. Any ideas? See picture on Facebook. Chris naggy thanks