I used the spacer plate from Carl's Scrap Pile. I cut the big hole and the outer dimension with a cutting torch and cleaned it up with an air angle grinder.
Works good, last long time, Joe.
I cut 3/8" off the input stub, but had an issue with the clutch disc not moving far enough along the splines on the input shaft, and I did not want to grind the splines to "fix" in wrong.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission