Center Section Differential Recommendation

IMHO you could use any of the three casings with a Sure Grip and the right gears with your 360/727. If you do any real highway miles then I would suggest 3.23 gears. Once you get into the Hemi and OD 6(?) speed you will probably want to get another chunk to take best advantage of that combo, and selling a 3.23 Sure Grip differential is easy.