An n/a Honda engine pumping 250hp will dominate a turbo Honda engine making 300hp every time due to variables in the power/tq curve especially when the n/a curve is alot more linear and has a more useable powerband.

Back in the days when 250hp was the best you can do n/a, that car with a competent driver and chassis setup would likely be in the deep 11s. As for the turbo guy with the same amount of power, it's likely they will still be in the high 12s/low 13s.