I tried the GM Heritage Center about a year ago and they had nothing. Just 1977 and newer.
However, starting in Mid April 2014, there is going to be a new possibility for older GM cars.
Quote:
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Starting in mid April, 2014, the National Corvette Restorers Society (NCRS) will now be able to tell you the dealer code, dealer name, dealer location and the production date your car (1965 through 1972 for Camaro, Chevelle and Nova) was produced!
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See here:
http://www.chevymuscledocs.com/