833 B to 833OD

I could not fit the o/d cluster into any of my 3 cast iron non-o/d boxes. My cases would have needed to be heavily clearanced.
That's no-never-mind for you cuz the box can just go into the B-body. All you really need is a long O/D mainshaft, and bolt your B-body tail up to the A-body box. That's what I did.
Take it easy shifting into O/D, it's been my experience that, that gear is not very strong.