back about 4 years ago when people with 240's actually went to the track, people with stock cams, stock t25, stock intake manifold were running low 12's. You need some kind of diff and a decent launch. Baby 225 DR's and Azenis were common. These stock SR w/bolt-ons car also consistently trapped 105-106mph, which if you follow drag, is pretty fast for a high 12. Oh yeah, stock rear suspension is a lot better at the strip than coils.
It's all about driving and setup. Vapor's car ran mid 13's with 400whp because it was on all-seasons, but it trapped 120+mph. One of RSE's old customers ran 10.8 with a simple 360whp 2871r setup, because the guy knew how to launch the piss out of a car on Radials.