casting numbers have nothing to do with the car model, those are specific to the molds used for the cast iron parts on the block.
it also doesn't appear as though any model information or even engine configuration information is found in the EIN.
the only thing i can suggest is looking for a 1980 RWD Pontiac that would have come with a 2 barrel v6. wiki might be useful for this.
it appears that the H-body cars were available with the 231 in 1980:
http://en.wikipedia.org/wiki/Pontiac_Sunbird
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Vladimir Lenin
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H.H. Goddard, Human Efficiency (1920)
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