Wanting a 18x9f 18x10r wheel setup am I crazy?

I am using BBP Moser axles and green bearings. I measured with a tape jr and came up with 2" to the outside of the wheelwell from the outer lip of the wheel. You might get away with a 285/40 but it would be seriously tight withat axle. Ive seen some Mustangs with that tire on a 10" wide and the sidewalls barely stick out beyond the wheel yet look good together.