Trying to identify brakes

since I don't know for sure and don't want to assume, would the spindle also have come from the B body? I have ready about changes needed when doing the swap to disc such as the upper A arm to get the bigger ball joint, any way I can tell for sure what my whole assembly is?

I think I am gonna name the car "The Blue Mutt", its like Johnny Cash built this car, one piece at a time.

There's several pictures in this article that have measurements that will help you determine what you already have. To figure out your spindles, you may need to pull the rotors to measure the spindle diameter.
DISC-O-TECH: Stop on a dime from Mopar Action and Rick Ehrenberg