Obviously slightly wider wheel widths would be preferred, but with due to class rules I understand why you had to stick with those sizes.
In terms of tires, you could run any of the following configurations without rubbing:
* Preferred for your wheel widths
Front: 265/35-18
Rear: 275/35-18
Front: 265/35-18
Rear: 285/35-18
Front: 275/35-18
Rear: 285/35-18
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