https://www.forbbodiesonly.com/moparforum/threads/fca-historical-services.148681/ This thread covers it.TChrysler historical or what ever Chrysler/Fiat calls it today can supply you with all the information on your car from that number...I have not done it in many years, there was a small cost involved, but they gave you a lots of info from that number.
Actually they started in 65 stamping the core support!In 64 that wasn't the practice yet. [I have a 64 Dodge Polara and a 70 Cuda.] The Cuda has VIN stampings in the radiator support and the cowl, but I have nothing like that on the 64. If my memory is correct, the factory didn't start putting the VIN in various areas of their cars until 1967.