The cowl tag is not an actual VIN, but it is a trim tag that notes the options that the car came with. Here's a link to a great site about identifying the chevelles and SS's.
http://chevellestuff.com/1966/66ss.htm
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1964 Malibu SS, now a LS1 and T56, Back halfed, rollbar, narrowed 9 inch, 4.11 gears and 31x16x15 Mickey SSR's on Weld wheels.
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