[Dominik]

Mike,

I thought the input shaft with 26-spline just calls for a 26-spline clutch blade and there you go.
Bellhousing and pressure plate are the same. Maybe not for the later LS-1 engines ...

Cal,
I used a M-20 behind my very torquey big-block for 7 years under hard driving conditons, not racing, and it held together perfectly.
The only modification was a sealed bearing at the input shaft.

I hated the ratio though. Gap from 3rd to 4th was too wide.

Dominik