It can be done !

I have a set of Schumachers that I modified for a four speed. They were behind a 440 and fit great, all original clutch parts were used. Only a year old before I removed them and put a 383 in the car with stock big block manifolds. No grinding or denting was necessary.

They are for sale now. 500 bucks plus shipping from Amarillo. I have been told that one company is charging 250 to modify them.

Rod