standard fuel system we have seen 396 I think it was, but no return line flow, the ramp rate was increased so more timing could be added to give an artificial power number, this was done as an experiment and the car ended up with 370ish final tune when loaded as we normally load them. Our electronic knock detection equipment picks up engine knock earlier than the human ear will pick it up, if somebody was to use a "spotter" to listen for knock there is a good chance that they will get more power for the same load conditions though because of the extra timing