NASCAR - what frequencies do you want? The sanctioning body or cars. If you want cars, get those race day before going to the track or buy the list at the track or have them program your scanner for a fee. Teams don't always use the same frequencies, and they can change day to day.
As for the NASCAR officials, they are all over the web. Dont forget IMS frequencies too as the spotters use them.
I just got home from t he USAC Silver Crown race, not bad, Bobby East led start to finish. I'm working both ORPI races plus the 400 this weekend
V