I ran 18x10.5 et 20 rears with a Hankook rs3 in the rear 285/35/19. I was extremely low in the rears and the rubber was just tucking. I feel as if a 295 in a semi slick would rub if you were dropped on coils. This is just my personal experience from my alignment setup and tire specs.
If you were not on coils that is another story and it may fit... Also a little extra camber may fit.
Here is a picture of 285/35 rs3
As a track dedicated setup I would say a 285 rear and a 265 front would be perfect with absolutely not fender modifications needed (I ran a 18x9.5 front et22 with a 265)