what you've posted is the EIN or Engine Identification Number. the last 6 digits of this match the last 6 digits of the VIN.
6 Z 199886
6 = 1966
Z = Fremont, CA
199886 = sequential prod #
see this page to locate the 2 letter engine code:
http://www.buicks.net/shop/reference...ent_where.html
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