I don't think slicks make it a race car. My car is a wife driven A/C P/S full weight car that gets drove alot but I'm not going to go and and spend another 350 bucks for MT's which are about as good as slicks after I have slicks already just to get on the list. I think driving it to the track and bolting on other tires should be O.K.
If your talking about a cruise, then race, does that mean the times posted don't mean anything and only the times after the cruise count?