SB bell housing

I ran into this same thing when putting an OD 833 behind my 318 in the late 90's. I didn't have access to other bearings retainers and chose to go the "turn down" route too. Word of caution, my shop wasn't able to take it all off of the outside of the bearing retainer because it would get into the outside of the bolts that hold it on. He had to take the rest out off the bellhousing by opening it up the rest of the way (he split the difference). Opening up the bell got close to the 2 bolts for the clutch fork pivot, but everything clears fine. The only downside is the bell and retainer are now a matched pair. I paid $150 then, not sure what one would charge to do this today. Just thought I would throw that out in case it's an option for you.