If you change the pedal bracket bushing to the roller bushings and weld the washers to the bracket correctly, the pedal should return all the way. If it doesn't, then I would guess the horseshoe bushings for the return spring are trash or the metal on the clutch pedal or the spring bracket has yielded. I had the clutch pedal on my 65 yield and all that was needed to fix was to weld and file the u-shape back into the pedal. I also just recently put the NPD clutch pedal stop in my car and now the clutch and brake pedal are about the same height. This was another nice part that was more than satisfied with if you are intending to drive your car. It is not an exact replacement, but nice for a good driver.
Don
gt350bp