If the whole engine inlcluding the heads are cast iron its a 65 or later engine for sure.Only 64s had the aluminum intake manifold and aluminum heads.I have seen people use the 215 intakes on the 300 but you need to make two aluminum runner spacers to fill the gap between the intake and the heads I believe but it can and has been done.....Look over on the V8Buick board as there was a guy that there I believe that made some spacers to adapt this intake,just do a search for 215 300 manifold swap maybe........
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