I haven't done the same application but I have an 89 Firebird with a supercharger. I recommend getting subframe connectors. There are a ton of other things you can do.
You can build up a 10 bolt to stand up to quite a bit of horse power. I suggest getting a aluminum differential cover with a stud girdle. You should weld the axle tubes to the pumpkin. If you start running slicks, then a 10 bolt probably isn't a good idea.
I would guess you'll be getting 30-40% additional horsepower out of the supercharger. You'd be running about.. what? 400-450 horses?
That's all I can think of right now..
Good luck,
-Bruce