Flywheel register hole.

I'm converting a 1965, 225 Automatic (904) to a A833 4 speed. I have a slant 6 flywheel with a 9.250 clutch/pressure plate assembly. The register hole in the flywheel measures at 2.125", the protruding flange on the crank shaft measures at 2.0," the flywheel bolt pattern matches the crank shaft bolt pattern. What am I dealing with here?
Norm