I had a 71 Buick Stage 1 coupe car for 12 years. The stage 1's were like a Poncho's HO option. Different cam, reworked carb and distributer, bigger valves in head. The stage 1 heads are valuable and in 71 shared the same casting # as the regular heads(have to pull head to tell). 70 had a casting # all to themselves. There are many more items, vin#, block # etc. that can be deciphered if its real or not.
There are some Buick books out there you can buy. As OPH said, these are valuable cars and are often counterfeited. Contact Poston Enterprise in Alabama and they will have the books you need. Also, a big bookstore should have Illustrated Buyer's Guide to Buicks. Much info in there also. [img]/infopop/emoticons/icon_smile.gif[/img]
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