COPOs consisted of non-RPO combinations of equipment for a specific customer. Over 50 years later, there is no evidence of an overall marketing effort by Chevrolet for COPOs 9560, 9561, 9737. Most Zones had a performance dealership or two and there is reason to believe Chevrolet made those dealers aware of them. They did provide information to dealers that contained service part numbers not found in the P & A manuals.
http://www.camaros.org/copo.shtml