Hello! I have a non X code 69 camaro with a build date of 10B. 57 57 paint with 721 interior. It has the hole in the firewall for the muncie speedometer cable. Factory discs on the front. The fenders appear to be original to the car. The Z28 emblems appear to be original to the car. Can see some green under the black repaint job done around 1989. On the side of the floor pan hump it reads 1969 CHEV, 1ST DRK GREEN REAR B/SS/37 9/23/68. Can anyone tell me what any of this means?