Need a little guidance from the gurus

So I managed to find a 1979 cordoba with a low mile running 360LA. Waiting to hear back on the transmission type but its an automatic.

Been hunting around the threads, but cant seem to find the info I am looking for:

From what I can tell, it should have come factory with a 8 1/4" rear end. I am a little confused as it seems this could be classified as a "r" body. Will this differential bolt up on the a body or does it require modification?

Obviously I will measure everything when I go to look at it, just wondering ahead of time to see if its worth the trip