If you're run their regular events the typical Pro course is between the practice speeds (Saturday) and the race speeds (Sunday). There weren't any open wheel cars there last year, so I have no idea what kind of speeds they would see. I'm going to gear my kart for just over 70mph top speed, but I'll be able to use all 6 gears on course.
Just be prepared for whatever gear you use that there is a drag race start with over 100ft straight out of the lights, so you'll want to get a hard launch.
97 Integra GSR GStock autocrosser
White/Honda F125 shifter kart
92 Talon TSI AWD