Just wondering if anyone can shed some light on the meaning of this firewall marking on a 1967 convertible. It shows all of the signs of being a big block car, but doesn't have build sheets and not numbers matching. Any thoughts/advise is much appreciated.

This marking is also on the rear fiberglass in front of the gas tank.
Thanks,
Dave

This marking is also on the rear fiberglass in front of the gas tank.
Thanks,
Dave
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