Dave,
Our track is not banked and I’m pretty confident that womps would perform horrible in it. There is also the issue that the store does not sell non-scale models. I have one 1/32 scale Porsche fitted with a falcon VII motor and foam tires, the driving style is very similar to womps but it does not turn the fastest laps.
I really don’t know anything about indy cars, I have a few F1’s. If you come by Thursday try to talk to Robin, he has a few indys and I’m sure he would point you in the right direction.