4 speed to auto crank?

When you say "cut a little off" do you mean off of the trans input shaft, that would be easier than drilling the crank but would it compromise the strength of input shaft at all?.

Yes, the input shaft, and I don't see a problem with strength, my recollection is that around 3/8" is all that is needed.

You may not have to, but MEASURE it whatever you do.