Engine/Transmission Mismatch

To bring closure to this thread I called Dynamic this morning and talked to the main tech - Sean Wiley I believe was his name. He did not recommend turning the nose hub as it would make it too thin and cause problems with the bushing that's inside the nose. As I suspected, his recommendation was to pull the crank and let the machine shop enlarge the pocket. He then brought up another point based on the converter - by the part number it was built and assembled to go behind a mildly modified 340 and I would be less than pleased with it's performance behind a stock 273/235 Commando motor. His recommendation was if I did the crank would be to send the converter back and they would rework it to use behind the 273. So I have these options to think about as well as go with a 4 speed since the crank already has the bushing or go with a 5 speed T5, Dakota or Colorado 5 speed conversion as detailed in another thread.