Rear Axle Identification

I don't know much about the E body rearends, but I know that in 1970 or 71 they moved the position of the Tee block on the A body 8 3/4 from the hump of the center section to the flatter part on the tube. Could be the same story with E bodies, but again I'm not sure. Maybe my brother blu340dart will chime in and give youa better answer. He is well versed in the E body cars!!! Geof