I built a 512 C.I. low deck stroker motor several years ago that used a stock type Eddy low deck 6 pak intake and modified 440 carbs., the motor made peak HP(612) at 5600 RPM and made peak torque at 4500(644 ft.lbs)RPM on a DTS engine dyno. I ran that motor in my Street and strip Duster that ran as fast as 10.34 at 134.+ MPH with the six pak on pump gas through the exhuast system and air cleaner on I did a bunch of testing on that car and ended up finding out that the motor like to be shifted at or above 7000 RPM to make the car run its fastest ET and MPH My message is the stock unmodified Eddy dual plane six pak intakes and stock type carbs, jetted to perfection, will make power well above the RPM that they make the most power on a dyno More air and fuel, more power