60s /6 to 727 adapter

Here Here guys ! I guess I too am in the minority being a Slanter and a Teen fan.(Just some support)
Don, I have no knowledge on the grinding so I can't help with that.
I do know that Chrysler was still using that adapter at least till 1968.
A local guy bought a 68 D 100 that needed help getting it running and it had the adapter /6 to 727.