All the numbers indicate the engine was originally installed in a 1964 Buick. The engine serial number was the same as the VIN that year.
The A indicates a series 4000 Special car with a V-6 engine. The last 6 characters indicate the individual car's serial number, the first car being #001001. For that reason, could the last character be a distorted 6 or 8?
The numbers do not match with Jeep VIN or V-6 engine code numbers from the mid-60s. 1964 would be a bit too early for the V-6 to show up in a Jeep as original equipment.
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