Question about car shows, and non-VW engines

[BeetleTwinTurbo]

If I decide to put a rotary turbo engine in my bug, can I still enter beetle car shows, and other aircooled car shows, since the rotary is "Water Cooled"

I mean, its still an "Air-Cooled" car, just using a different means of propultion(sp?)

well, anyways, I dont see why not, but then again, it would fall in more of like a "custom" class i guess.