Unfortunately we get very similar questions on the 2x4bbl engine cars every few months that no one here can answer. Other owners and clubs have dug up the numbers on the 64-66 Rivieras and the 66 Wildcats. These results can be found in several other car club websites and auto bulletin boards.
This gives hope that the data still exists for all the Buick series that used this engine. If any place has it, I would say it would be the Sloan museum in Flint, Mich. www.buickgallery.com There will be a charge for the research though if they can help. Good luck with the search.
What has been, can be again. (Bob Wills, 1942)
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