First sign is if you have a 2 bolt or 4 bolt valve cover, second with valve cover off measure diagonally distance of 2 studs measured center to center. You should come up with either 3" or 3 1/8". Most A series engines will use the 2 bolt valve cover but there have been some series B engines that used the 2 bolt cover. Most important is the stud spacing. 3" spacing will be the series B engine where the 3 1/8" spacing will be the series A.
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