Another 416 on the dyno

Horsepower = torque x rpm / 5252

Given the numbers you provided...739 torque x 4500 rpm / 5252 = 633 hp

If we solve for torque, it is... 467 hp x 5252 / 4500 = 545 lb/ft

Even correcting the conversion, it all seems very high for what sounds like a very mild 273.

Here is the numbers:

Torque = 544.8 (ft.lb)
Torque = 738.9 (Nm)
Power = 466.8 (B.H.P)
Power = 348.1 (Kw)

I don´t know i you are using (ft.lb) in the States? here we use (Nm) Newton meter.
And as I said Before, I´m not Believe this to 100% so I will do Another check when the spring comes in Another Dyno :)
And then I´m going to check it on the 1/4 mile track :D