Hey all,
I have built a few nascar kits, but i use general paint schemes. The generic interior and chasis colors are grey, and the drive shaft is usually white. However, the best shots i have seen latley arethe in car cams, they do offer alot, unfortunatly not every car has them.
I have found a great NASCAR forum, http://randyayersmodeling.com/modelingforum/index.php?sid=f6ef97360aa46931cfeb1651769cd452 , the people there are very knowlegable, and there are pics there to help you out.
Also, if yourlooking to spuce up your models, try this place, Modern Motorsports, http://www.angelfire.com/nj4/mm0/index.html , i have ordered from them, and the parts and service is awesome!!
Hope this helps a little!!