As said above, same day, new cams,same rollers, same ambients and yeah it would prove something. Prob is how old was the Piper when it was ran up? What condition were the the lifters in? Did it have a vernier? Same plugs, same age? Ignition leads, rotor arm, cap, etc all the same condition? No tinkering since the last RR? Same wheels, etc, etc, etc, etc. Could go on forever and the answer would be no, the car wasn't the same as it was before