I've built and dyno tested a bunch of different Mopar motors of all types.The last pump gas 426 Street Hemi motor that I built and dnyo tested, 4.270 bore with 3.91 stroke, stock Mopar NOS late model iron replacement heads and stock street Hemi intake with 1967 carbs. made well over 500 HP(actaually nearer to 607 HP ) on CA pump gas at 10.5 to1 comp. ratio. My thinking is your motor will to Have you had it dyno tested or ran it at the track? If not maybe you got more HP and torque than you think I normally get more HP per C.I. from a N/A/ Mopar wedge than I do on them dang 426 Hemiroid motors I guess I'm not Hemi whisperer