someone school me on my A833 for my swap Please

So I picked up an A833, I'm wanting to convert my car to a manual. I've done a bunch of searching and studying and its all starting to blur together at this point.
The guy I bought it from said it was from a '76 A Body, that's all he really knew about it.

I ran the numbers and its coming up as a '77 model.
So here are the numbers on it;
5.125" front bearing retainer, 23 spline input, 26 spline output #C13157
12.5" Aluminum tail shaft #C 133 64A 4-26-77
Case has the interlock style cover on it #C 13303 G 4-1-77
and the raised id plate is stamped: 7B432450
PP8335795

I'm trying to figure out what I need to do for a bellhousing to mate to a smallblock 360
I can do the machining but haven't really found too much on which one I should start with, Is the bigger bearing cover mainly used for big blocks? Thanks in advance!