Posting a dyno sheet would really help.
That said here is a WAG. Note even at a dyno correct = 1.0 it is not using 750 CFM.
Stan
Engine_Size_=_462.18350__-__Volumetric_Efficiency_=_0.83000
BSFC_=_0.46000__-__Air_/_Fuel_Ratio_=_13.0000__-__Blower_Pressure_=_.00
BSAC_=_5.9800__-__Barometric_Pressure_=_29.9200__-__Temperature_=_60.00
__________UnCorrected______Fuel
_RPM______HP_____Torque___lbs/hr___SCFM
_6500___552.62___446.51__254.203__721.54
__________________
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