BBQ,
Yes, they provide a cowl tag decoding service. They will not tell you what the codes mean but they will tell you how your car was equiped when it left the factory. The service is available through the Late Great Chevy headquarters or through the Jersey Late Greats. Either way, Verne provides the information. There is a charge, I'm not sure how much, about $25 I think. Check out their web site. Not sure what their address is, just do a search for Jersey Late Greats. Hope this helps