Have you tried hitting General Motors? They have been helpful to me for finding the age of parts but on newer cars. Have the #s and VIN ready if you call or email them - that will help.
If that doesn't help - try HemmingsMotorNews.com and see what older cars freaks can help you with. Good luck witht the project, T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/