Does anyone know if this class is traditional sprintcars or winged at the Klash in Mid-October?

Generally they are the wing class cars that run at tracks like US 24 or Miami County.

Bill

upright or sidewinders?

Sidewinders. I dont believe i've seen any uprights try to run it.

Len brings up the usual problem. 600's are not sprint cars. The whole mini, micro, sprint, midget discussion is usually later in the year. Your signature says South Bend. As the owner of a sprint car I sure get tired trying to explain why I don't run Plymouth. (For those out of the area they run 600's, but I'm not going to call them something.)
Drivers, owners, and promoters need to be more careful in communications. I would guess that it will be like they ran in April.