You should always use a new gasket. They crush when torqued down and once crushed won't seal properly if reused. All Kohler head gaskets are metal faced the only thing to watch for is if it has a fire ring (a band of metal crimped around the inner edge of the gasket). Cheap gaskets don't have it and I've heard they are quick to blow. Never used one myself. If your old gasket leaks, it could make short work of your nice flattening job on the head.
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