Any benefit to 10” wheel?

Yes. If you have room, and have the right backspace, those tires will like the 10" rim much more than an 8.5.
I have heard of 275s on 12s and 14s on small tire no prep street racers.
I have 315 et radial pros on 12s, but I have a car with room for an 18" section on a 15x14 rim.