yep, looks like a buick, OMC used the buick v6 through the 70s and into the early 80s, I have a customer with a 1978 searay 30' that has twin buick v6's , Id drop a 4.3lx merc with an gen2 alpha drive , they can be picked up rather reasonable in the used market.
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1973 20' seafari ob "old Yeller" sold
1972 25' seafari W/ 150 mercs {under renovation}
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