489 8.75 casting

741s are stronger than you think. stick the suregrip in the 741 if you like your gear set

I used to build gears. The "stronger/weaker" arguement is like discussing which is better: A HEMI or a 383. Everybody knows that the HEMI is stronger, but still, you would NEVER throw a 383 block in the scrap heap!
You are talking strong, stronger, STRONGEST, not WEAK ,strong, stronger!
ANY 8 3/4 rear is better than the next best thing. Unless you are running huge slicks, you are not likely to break a 741 rear.
Greg Purcell