If that's the cowl tag or the phs date, you need to find the engine cast date. It's back by the distributor hole usually so covered in oily muck you can't see it. Mine is K088. Or Nov 8, 1968. It's the VIN stamped original in my first week of march car.
To find the date, Get in there with an iPhone and get a picture of it. It's not easy but needs to be done. The head dates should be within a few weeks either side of that date.
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