Cleveland heads need a lot of modifications. 351W heads bolt right on, but you will need special washers or head bolts. 302 uses 7/16 and 351 has 1/2 holes. 69 & 70 cast are the only ones to use. Porting & polishing the exhaust side is recommended. Unless you get them for free, don't pay a machine shop to compeletely redo an old set, because you'll spend too much. Oh yea, hardend valve seats are highly recommended to burn unleaded gas (machine shop must do this).
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