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What I'd like to do is have an idea of the approximate date at which this engine was rebuilt. Any thoughts?

Check the large casting #'s on the (iirc drivers) side of the block which will tell you when it was cast. No way afaik to tell when it was rebuilt & I have never seen a casting date on a piston (not even a yr) and the "80" rather than a # between 1 and 12 for the month part eliminates that possibility.

live every 24 hour block of time like it's your last day on earth