All I can say is I went from a "good" running BB to a Gen III. The BB was a pump gas ,hyd cam, flat top, ported stock heads, RPM intake and FAST EZ TB EFI. At 3400 lbs the fastest it EVER went in the 1/4 was 112mph with Sunoco 112. Gen III has flat tops,ported stock heads, ported stock intake, hyd cam and EFI. At 3700 lbs it went 122 MPH first time out with 28 less cubic inches and pump 91.