Please see this PDF. The engine casting number, "Utica" number (if present), and vehicle number are all separate.
What I'm referring to is that in the front of the engine, right in front of the valley pan, should be the vehicle number (same as the driver's door jamb number). If these two numbers don't match, either the car was engine swapped or VIN swapped, no other possibility.
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=2727
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