Most motors have adjustable endbell timing, and you have FDR adjustment. The dyno will allow you to optimise these to get the best out of the motor you're running.
Oval racing is pretty simple for motor setup, compared to circuit racing. The first thing to do is race with the Sentry on your car, so you can see what rev range you're using on track. Compare that to your dyno power curve and adjust the gearing so that you're in the peak power range for as much of the lap as possible.