8.75 - 741 & 489 Rear Ends Worth Restoring?

The Chucks will bolt into all 8.75 housings. I believe the B body housing is a bit wider !/4 each side maybe 1/2" Total? Someone will chime in on that. Those are non posi chucks but you could buy posi units and ring and pinion overhaul kit. The chucks the way they are now can still be sold for someone I'm sure. The 489 case is desirable.