The new input shafts are not holding up very well, so either repairing yours or finding a good original replacement would be my choices. There are 2 ways that I could make it work. I can put it in a cylindrical grinder and grind it down past the rust and then make a new custom pilot bushing for it, or cut it down and weld it, then grind it to the original diameter.
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Freddie
1969 Camaro RS/SS396 (427) 4 speed
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