i had 17 inch FR500's with 315/35/17's. Quad shocks were removed, but fenders werent rolled and they rubbed on hard corners. Id imagine with a little work you could get a 325 in there.
I have 17x11 (27mm offset 7" BS) with 315/35 Nitto dr's. I plan on going to 335/35's next time around. I have the quad shocks removed and no tailpipes, but I have plenty of clearance for the extra size.
I also run 26x11.5x16 ET Streets and they fit fine also
I run a 15x10 6.5 BS pro star with 28x12.5 ET streets on my 94. A 325/50 drag radial will fit but you have to work the inner wheel well a bit. The 28x12.5's only rubbed a little bit.