Mike,
One of the reasons that Kool April Nights won't let newer cars in is they only have room for 2300 cars and have to turn away some every year. As for some of the smaller shows, I am not sure what their reasoning is as I like to look at the new cars, especially the high end ones that I can't afford. Some of them are starting to let newer cars in now, since there are several of the Shelby Mustangs in this area. But I don't think our big show will ever change to let new ones in because of the amount of older restored ones they have that want to enter.
Ron