Power band

As for timing if that is what you mean, Usually they have more timing where there is peak torque. It is perfectly normal for your stock 2000 tune to look like it does. Bad flowing heads and a few other things allow it to accept the larger timing numbers compared to the newer ls3 based engines with better flowing heads.
On the dyno you will see that the timing just follows your torque curve, then the horsepower takes over pretty quick past that.

