Based on build configuration information provided in 1989, Chevrolet produced 1,066 1969 Camaros with 427 engines. Over 50 years hence, the current body of knowledge includes build configuration for about half of them, via cars that still exist or original paperwork. None of those COPOs were built with JL8. That leaves quite a few COPO Camaros we know nothing about.
Was it possible? My opinion, probably not. COPO 9560 [ZL1] and 9561 [L72] were not regular production options. They were custom-engineered combinations of equipment that included a special rear axle assembly only used with 427 engines. The JL8 option included a different, special rear axle assembly modified to adapt Corvette disc brakes with parking brake. A COPO 427/JL8 Camaro would have required yet another production rear axle assembly. There are no axle codes or technical information to support the existence of such an axle.
Of the 206 production JL8 Camaros, 50-60 are known. Only one is not a Z/28.
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