Might be time to conform the hidden VINs. Black tail panel, IF original, would indicate a BB car. Since it has the dual exhaust hanger (unless added by smomeone), and disc brakes (which could've been ordered on any '69 Camaro), maybe the VIN tag has been changed and you've got a COPO car. Don't get your hopes up because that is a VERY long shot, and if the VIN has been swapped you've got a mess on your hands, but checking the hidden VINs would be my next step. Nore than likely the black tail panel and dual exhaust hanger has been added over the years.