8 3/4 rear 741 / 742 center case question - HELP!

The differences in the cases 741, 742, and 489, is the pinion shaft diameter. The 741 has the smallest at 1.375" , the 742 is the next size up at 1.75" (but is straight rather than tapered) which some people prefer, and the 489 is the largest at 1.875". I`ve seen a lot of power in front of a 741 with no issues. I think you`d be fine with either case especially if you install a cruising gear like a 2.94 or 3.23.