62Clyde...You using reman parts ???..If so junk the whole set up and buy a new kit with matched disc..pressure plate and throw out..I have been thru this a hundred times I swear...Not only did GM make a hodgepod of different clutches after the years went by the rebuilders mixed them even worse..And then and then the pressure plates have been turned who knows how many times and they would make up for that by building the disc thicker..There were at least three different throwouts all of different lenght and style depending on if the pressure plate was diaphragm or three finger type..If you are using the full circle bellhousing it can be a real pain because you can't see whats going on when all together..I have found them with too long of a throwout that actually hits the disc and shoves it back to the flywheel and not allowing the main shaft to stop fully.I drove a Chevy for years that when going into first or reverse I pushed the pedal only half way down to get going and after that the syrncros did the rest in the upper gears...Buy a new kit..Good luck..Al...
