SB bell housing

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

Can you measure the bolt circle of the front bearing retainer? What bell housing casting are you using.