The first two digits of the top row are the GATE. The next three are the BASE numbers. The next six are the SEQUENCE numbers. These numbers are part of producing the body in white or the bare shell of the car.

The next three groups are the ENGINE, AXLE, and TRANMISSION assembly numbers.

Seeking:

1969 St. Louis plant VINs, SPD, and VONs.
Over 2,000 thanks to you!