I have limited experience comparing "all the numbers", ie engine dyno to chassis dyno to track performance. But where I have direct data along with other observations my conclusion is that a not-happy engine dyno compares well with a Mustang dyno, and both correlate well to track data.

But for this discussion it is immaterial, whether it's on a Dyno-jet or Mustang, IMO. The OP does not seem compelled to brag about HP numbers, but certainly needs accurate power curve to rpm data to make meaningful conclusions.