Technical Cadillac 331/365 crankshaft differences

I have a 1956 Jetaway transmission bench job in the shop from another shop.
I do not have the car. I hate doing bench jobs, I would rather have the whole car!

Story goes: A first shop converted a 55 Cadillac with a 331, from the Dual Range Hydramatic to a 1956 Jetaway because the owner wanted a park position that the Dual Range does not have.
Guess the owner didn't know that if you shut off in reverse, it would have a park like position. Dumb on the owners part.

The transmission wouldn't operate right and was taken to a 2nd shop to fix.

They decide since the 1956 Jetaway was notorious for being a bad design, they got another trans core to have rebuilt.
Still can't figure the logic on that one. They get another long tail shaft, one year only Jetaway and rebuild that one. Still a1956?????

That one won't shift, had it apart twice and now it comes to me to fix.
This shop knew of me, but my reputation was too pricey!

The core they built is a mostly junk, major rusty POS.
Told them most of this is not rebuildable, bring me the trans you took out of the car.

This is where I am at now, haven't opened up the other trans yet.

My huge concern right now is the fluid coupling cover appears to have been rebuilt by a converter company as it has ink # stampings on it and appears to have a new hub.
It has heavy heavy wear on one side of the hub and no wear on the other side, like it was not centered with the crankshaft.

Suppose it could have missing dowl pins for the bellhousing also, but you would think they are smarter than that. But?

A Dual Range Hydramatic has a totally different flywheel along with a pilot bushing in the crankshaft for the input shaft, Jetaway has a pilot on the flywheel, which goes into a register on the crankshaft to center.

My question is, is there even a register on the 331 crankshaft for the Jetaway flywheel pilot to center it?

I have looked on line for photos, to try to compare the flanges on the 331/365 crank and have not come up with anything yet.

The only guy that I know that would have had an answer was Gene Bersk, but he is no longer with us.

Maybe some of you Cadillac guys would know if this conversion that was done, is even possible.

Bill