It depends on the year of the Stang, and if the front fender has ever been removed. Also, unless I'm mistaken, even 92-93 Stangs need rack limiters with an sn95 front spindle and 17x8 rims.
For my poor '86, I have the smallest fender opening - especially at the bottom of the opening.
So, I come within a snail's breath of rubbing the bottom corners of the fenders - 245/45/17 tires, D178 rims, M2300K kit. Part of that is also how much camber a
particular car can have. Those top openings aren't very precisely oriented with respect to the k-frame. So, in my case, even with MM CC plates, I can't get as much negative camber as I'd like. And, *I* am not about to widen the opening on the top of that POS wet-noodle strength strut tower.
I see camber as another big factor with how well tires fit within the wheel well. It's just
one of those many many issues in getting something to fit which is bigger than the car was originally designed for - like with exhausts. Many tolerance issues, many small tweaks that people do, etc.
Heck, if it was easy, everyone would do it, and not have any problems.