There's a decent amount of room back there. Not a complete apples to apples comparison but I've got 18x9.5's with a 275/40/18 tire on the back of my wife's 71 Chevelle. 0 offset, straight off the shelf, but does have disk brakes. There's PLENTY of room with that setup.
On that car specifically I could go 10.5" wide with a 305 tire in the factory wheel house pretty easily, but you aren't buying 0 offset wheels in that situation. You'd have a custom backspace.
Wife 71 also has an 18x8 with 245/45/18 rubber up front, again, no issues. Her car is lowered 2" all around.
The GTO should have similar amounts of space. It's always best to make sure first though. Get out there with some rulers and straight edges and measure what kind of space you've got back there.
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-Jason
1969 Pontiac Firebird
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