Actually, I spoke with Allen at Hershey regarding this and that head gasket has been discontinued and is (will?) no longer being manufactured. Mark Auto also ceased production on their "greyish" cored gasket.
What some of us are doing is carefully pealing back the copper clad around the edges and using thinned white enamel to paint into the edges so it will soak into the core. This seems to work well as it also tends to do a better job of keeping the coolant from "wicking" over the edges.
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