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To re-open the can of worms on the black Nova from a month or so ago...
The engine pad stamp was given the "OK" by some experts, right?
Heads were wrong, but those can be swapped even if it made the car run like sht. No way to say if they were original (not likely), but I would say there is more validity in a "verified" engine stamp than I would in a set of heads. At least that is what I would focus on.
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Dave........Correct.......Also "Focusing" and documenting the cars past history would have helped

......withstanding the fact that the car was built 5 months after the engine option was cancelled by GM....