I finally finished the Powerglide for the Daytona.
I was going to use the car's TCI midplate to adapt to the GM bellhousing, but changed to a JW ultrabell instead, minor delay.
I will still use the midplate, but just for chassis mounting, not an adapter.

I used a saws-all to initially cut off the transmission bellhousing.
Then cleaned it up and made the final clearance on my Bridgeport milling machine. A die grinder can be used instead, it isn't critical.