Engine/Transmission Mismatch

This has been done to death on the Slanty forum & over at .org, and cutting the converter hub has been tried,....don't. It's possible to cut the hub register in the crank O/S
to accept the larger later converter, and has been done w/o problem, there is no real radial stress there once everything is installed and torqued down, it ensures the crank
& converter are in axial alignment. There are a couple, but not many, who will build hybrid converters....basically a late unit w/a small hub-nose.....but they sound like they
are less and less fond of bothering to do it.