In the heyday of muscle cars, if the buyer knew what boxes to check on the order form, they could get a rocket right from the factory, in effect doing the much same thing as having Yenko or Baldwin-Motion “improve it” after driving it from the dealer’s lot. This dealer option was abbreviated COPO---Central Office Production Order.
Revell’s re-released their ’69 Nova SS kit in a less-glitzy COPO version, with additional parts for the 427-cubic-inch L-72 V8, and applicable chrome parts as well---the SS chrome parts are still included in the kit.