If you don't have 326-350 specific gaskets and your block has the bore chamfers you have to use the larger bore gaskets or they'll overhang the chamfer and not seal.
Notice the oblong shape of the 350 gaskets in post #3, that's how big you gotta get with a circular bore gasket.
But, it's not like we have many options anymore, scrounge or use the 400+ gaskets.
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