I use to race a 1968 street hemi in NHRA stock back in the early 1970s, the first "cheater cam was a Clay Smith conventional lobe type solid lifter cam. The last legal 340 motor I built had a Isky round nose, AKA as a "square" nose cam that would check legal in the motor with the proper rocker arms on it I tested three different cams in that customers motors, the best performing cams was a Lunati with standard designed lobes, pyramid or pointy nose lobe cam. Both Iskys where square nose cams, one ground on a 107 LSA and the other one was on a 105 LSA where real peaky on the engine dyno, they made 10 HP more than the Lunati did but the Isky cams wouldn't make 400 HP until above 5500 RPM and would nose over real bad after 5900 RPM and be below 400 HP at 6100 RPM. The Lunati would make 400 HP at 5000 RPM peaking at 6000 RPM with 420 HP and make 400 HP at 7000 RPM That was back in the early 1990s
I think I ran 160 lbs on the seats and around 350 + lbs. opened. The Isky cams in that motor liked to be shifted at or lower than 6400 RPM, the Lunati liked to be shifted at or above 7000 RPM, it picked that car up around 2 MPH in the 1/4 mile also