[62c30]

I recently bought a 1976 c30 crew cab 454 with a 4 speed with factory air conditioning. Its just a parts truck but the cab doesn't have hardly any rust or dents, the rest of the truck is just about junk. i'm not too familiar with this style of truck, i have been told that factory air conditioning cabs are hard to find. I hate to just crush a good part if it is usable or rare. My question is, is a factory crew cab 1976 with factory air rare or not? Thanks