Did any of you horsepower calculator guys ever use this

I did but we don't know the actual head cfm for sure so used [email protected]" for those 365CNC's which may be a bit generous even with a 440-2, and used 8.35 for dynamic both of which may not be accurate, came out at 659hp, not a million miles off of 694 but still low if I'm anywhere near correct

It shows 618hp for the 572.......made 716.

What’s the actual CR for that 589?