360 converter

You got it. The one fellow mentioned he had a spacer made that adapted the the older converter to the 360. I would bet that's the cheapest way to go. Of course you'd also have to use the B&M flexplate to balance things but I think their only about $70 US.

May be a dumb question but
Could this be done with a "bushing" increasing the diameter from
1,55" to 1,81".
This is in reality two issues to solve.