My Delco book shows your distributor, number 1112006, uses a vacuum advance number 1116210. The sheet is dated 1978 and has about 25 different distributor numbers on it. I have no way of knowing what was changed on which of those distributors that caused that page to be updated. The short Delco number would be D1336. The 1116210 advance unit is stamped MS 210 16. I don't have any Buick parts catalogues from that time, but maybe you can find someone else that does.
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John Brown
This isn't rocket surgery.....
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