b-man is right of course but PHS only useful if the car in question still has its original VIN and Data Plate tags. It is possible for either or both of them to have been swapped out. VIN tags were swapped when these cars were new by auto thieves to launder a stolen car by the expedient of taking a VIN tag from a clean wreck.
The 5 group code 5N was only regurgitated on the Data Plates in '64 at the Kansas City and Pontiac, Mich Fisher Body Plants.
Fremont and Baltimore never regurgitated the 5 Group codes although all Plants used the 5 Group code system for production of the Body Assembly.
Fremont coded a handful of GM UPC codes on the Data Plate, B70 and B80 were among the UPCs you can find on a '64 Fremont Data Plate.
Fremont shielded the Data Plate when painting the firewall so at most you would see overspray at the plate edges. The one in the pic would seem to have been painted over post production.
The '64 Fremont PHS record can be used to determine that the VIN tag and Data Plate are from the same car.
There are ways to confirm that the tags were always attached to the car in question such as the VIN stamp on the frame and date codes on glass and body panels.
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