Bill,
Did you change out any Internals, or have plans for same in the future? Seems like alot of power for a stock bottom end. Nonetheless, it's a example of why the ATI is so popular, it's the King of hp. What are your torque number, and could you post a dyno?
Good Luck with your setup, and great deal BTW, your very fortunate.
Jason

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475 RWHP, 426 TRQ. / Magnuson
570 RWHP, 589 TRQ. / N2O
Heads I Win, Tails You Lose