Sorry, I didn't uderstand the question. Maybe I should delete that last post. (remember, I just think I'm a smart ass)
There a (3) 23 spline 833 trannys, that I know of. And I have all 3. (not counting the short a-body tailshafts)
If you look at that bellhousing bolt pattern, you'll see that it fits a 3 speed with a square bolt pattern and the 833. It's just that that center hole is for that smaller bearing and Front bearing retainer.
How is Chryco going to shorten this thread for the archives? Up to 8 pages now.
Rob