Everyone I talked to said that 1966 was the last year for Pontiac not to have a vin stamped on the front of the engine.
I would check the date code cast in the block back by the dist. hole and compare to the invoice date of the vehicle.
Other's here will help with greater detail,
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1966 GTO Post Coupe, 467ci. N/A Pump gas, best 1/4 11.6 118mph
1966 GTO Post Coupe, "The Bright Idea" 535ci. N/A Pump gas, best 1/4 9.56 139mph
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