Todd, I really think you are on to something I just googled it and found this link.
http://www.holisticpage.com/camaro/camaros/copo.htm
In this link was this paragraph.
The Central Office Production Order (COPO) was a back door around Chevrolet's performance limits. COPO 9561 was the factory 427 cid Camaro, with either 435hp and solid lifters in the 4-speeds or 425hp and hydraulic lifters in the autos, and COPO 9737 was the Sport Car Conversion Kit, consisting of E70X15 tires on Rally Wheels, a 140 mph speedometer, and a 1 inch front stabilizer bar. The first COPO 9561 cars were delivered to Yenko Chevrolet in January, 1969. Cars built through late May had a Stewart Warner 970 custom service tachometer with a special sending unit installed. Later cars received the factory tach. Your Yenko could be ordered with or without stripes and spoilers. The stripe package included "SYC" decals on the front headrests.