SB bell housing

Looks like you want to run a newer aluminum 10.5 bell housing? You can also swap out the O/D main case for the small 307 standard A Body one and it will slip right in with the small front bearing retainer. What front bearing retainer is on the trans now?
Not sure, tranny guy rebuilt it, then I took it to garage that’s doing the S6/V8 swap. Dan at brewers said turning down has been done before - they didn’t have a housing in stock. We are pressed for time, so new case locate and rebuild are off the table at this point. Lesson learned, should have bought a 67, 68 car lol