Not really. You can argue back and forth about whether or not the 742 or the 489 is the stronger case but really you're splitting hairs to say one is better than the other. I like the 742's because they don't have a crush sleeve, you can install a crush sleeve eliminator in the 489's though. But you'd have to install one. And I haven't had a 3rd member rebuilt yet, everything I've run was original in the car when I bought it or swapped in straight from the wrecking yard or swap meet.
So between the 742 and the 489 I would say it's really just preference. The 741 isn't as strong, but if you're talking about a street car you probably won't even hurt one of those unless you're running big horsepower or drag radials.
