I built one last summer.It was a low milage core.Used the stock cast pistons and stock cast crank.Put a set of max wedge heads on it that was cut all to hell.Put one of my roller cams in it,cam was a NOS grind so it had a wide lobe on it.With 1.6 rockers was 620/640.This has been a heck of a motor.On the spray it ran 6.40s in my wagon.I have hit it with a 200 shot for a year now.