Great information about what to look for in a COPO. However, most would apply to any big block, although the only big block with X11 or X44 would be a COPO. This is good information for unrestored possible COPOs, I would not use it to confirm restored COPO. As an example, my X11 Yenko replica has every one of the items you cite, and it is clearly not a real COPO.
Minor point on the 9737, Center fuel gauge would only be used with in-dash tach. If the car was ordered without the optional tach, (in the earlier period when it was optional) the fuel guage would be in the right pod of the instrument panel (standard placement)
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