someone school me on my A833 for my swap Please

You're on the right track for your swap. The good news is that you can use everything.

The larger 5.125" bearing retainers are used for the later transmissions. I'm almost certain that this is an Overdrive unit. Most of the 26 spline main shaft aluminum case ones were.

The way to tell is to pull the side cover bolts off, pop the cover off and have a look at the cluster gear down low. If the trans is a 1:1, the gears will get sequentially larger/ smaller. If it is an O/D, the largest gear will be in the #3 position, 2nd gear tooth set from the front of the case on the countershaft gear.

The shift links on the side of the cover, if you have not moved them, will also show the front 3/4 shift lever facing the opposite direction (up or down) of the other link that shifts the low gears.

You can use one of the three bellhousings that either have 5.125", 4.807" or 4.354" index holes and get what you have to work, as long as the bell is going to clear the 130 tooth flywheel and 10.5" clutch disc/ pressure plate.

There is a way to get any of those three bells to work, which should help you find one for the small block a lot easier than hunting down the 5.125", although that will save you some work.

Most of what I've found have the 4.354" hole, which can be punched out to a 4.807" and the retainer cut down to fit, without running into the fork pivot bracket holes nearby, as long as you only cut enough material out of the back side of the bell to get it to go in, it leaves enough room for the bolts on the front side, which only go about halfway into the bell.

You will need the fork, z bar, fork mount points for the car and the trans, bushings, pushrod for the pedals, the pedals themselves, the sheet metal for the floor, a shifter, a handle and either a pilot bushing, or if your 360 has the large hole, Brewer's Performance carries a pilot bearing that will work.

I don't know how much torque you will be pulling, so I can't make a clutch suggestion, but McLeod has a nice line of inexpensive diaphragm type pressure plate/ clutch kits that are a lot easier on your feet and don't require such a heavy duty pedal return spring, when compared to the 3 finger type pressure plate sets.