The stock wheels are 15"x7".
I ran 31x10.50's on the stock wheels and they worked fine. You could get the 32x11.50 on the 7" wheels, I think there have been a few on this site that have done it.
If you go to 32x11.50's, are you changing the gears also? If not, the stock gearing will produce a significant loss of performance. It's harder on the motor and transmission also, not to mention gas mileage.
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DOGMAN
91 4dr 5sp
5.5" Superlift
"Downhill is just uphill in the opposite direction"