Keep in mind that Hughes build their CNC ported Pre-Eagle heads flow 347I 166E@650 Lift....so with Eagle, Apache, or Edelbrock heads you will make more HP, the only question is going to be where will that HO be in the RPM band....the high you spin it the better the rockers have to be.

These G3's can make a dump load of power with less cam than the same Cubic inch LS engines...the LS engine NA advantage right now is RPM.