From AI. They gave me three other ones when I went back and corrected them after I saw what you posted. Yikes. I'm afraid to ask them about USAC points now. I do know they award passing points.
In dirt High Limit sprints, they award passing points from where you start to where you finish in addition to finishing positions. 1 point for each car a driver passes. The Top 3 finishers on the podium get bonus points. Doesn't take a rocket scientist to figure it out. -2 starting from 50...