When I was attempting to find a second VIN on my 1969 Miller Meteor ambulance, I called the Cadillac Division of GM, and eventually got to some one in one department that told me that whenever they did have a warranty issue with a CC car, that they just instructed the servicing dealer to disregard the engine numbers, since they didn't match the cowl VIN many times. This is the case with my 1969 MM. One has to keep in mind that in 1969 there wasn't as much emphasis placed on keeping matching numbers as there is today.
I remember when a very low numbered first production Chevrolet Corvette came up for sale, the auction house in an effort to get the most dollars out of the auction asked the seller if it were OK to remove some parts that they knew were numbered at the factory, and should correspond to the VIN. Upon removing either the headlight assembly or the tail light assembly, they found that one matched the VIN and the other was off by 2 or 3 digits. Someone then pronounced that even Chevrolet couldn't keep the numbering system consistent on the assembly line from the first car. What was considered an acceptable practice in 1969 wouldn't be considered acceptable today.
I remember when a very low numbered first production Chevrolet Corvette came up for sale, the auction house in an effort to get the most dollars out of the auction asked the seller if it were OK to remove some parts that they knew were numbered at the factory, and should correspond to the VIN. Upon removing either the headlight assembly or the tail light assembly, they found that one matched the VIN and the other was off by 2 or 3 digits. Someone then pronounced that even Chevrolet couldn't keep the numbering system consistent on the assembly line from the first car. What was considered an acceptable practice in 1969 wouldn't be considered acceptable today.