I have an IMCA style stock car that also fits the Cotton Bowl/I-37 street stock rules, plan to run it soon. The car is similar to the car that I raced at Red River and Altus in the sportsman class and at a few Dallas area dirt tracks after I sold it.
It definitely would be fun to put on a sway bar and move the ballast.
Both the street stock/stock car class and the factory stock class could be great on pavement.