I ran 11.92/118 on a 100% bone stock 2018 on P Zeros. 1.87 60' too.I ran 325s on a 10.5 inch wheel on the boosted 15 GT. They did extremely well. In the summer heat they would hook at 22psi. And I’d lower the psi to 16 in the fall when the temps would get down in the low 40s. I don’t see why a 275 tire wouldn’t do well on an NA car.