I would say it depends on the heads, how well they have been ported. I dyno'd with gt-40 intake, full lengths, off road, cat back, ported & polished heads, 1.6 rr's, pulleys, pro m that was giving bad driveability issues, 24lb inj, with exh leak 260rwhp (acutally 259.7, but wanted to round to make myself feel better), I think around 270-290, maybe 300 on tune, and like I said, how well the heads are ported. (factor less if your running nitrous tune)
Also, it was a 248c dynojet, so if you get it dyno'd on a mustang dyno, would be less.
Just my opinion.
Also, it was a 248c dynojet, so if you get it dyno'd on a mustang dyno, would be less.
Just my opinion.