Felpro makes a steel re enforced valve cover gasket, and it will work fine with stock heads. However, it does not work with some of the aftermarket heads, because the lip on the head is not wide enough. They were about $26 for each valve cover last time I got them, so they are very expensive. However, they are completely reusable and last forever. If you don't want to spend that kind of cash, get the rubber Felpro ones. Felpro does not make a rubber gasket specifically for our cars, because it has a cast valve cover. When you go to the parts store, just get a Felpro rubber gasket for like an 85 Ford Crown Vic with a 302. I think the number is VS13264R, but don't quote me. The only difference is that the gasket has these little nubbies on it, that fit into the slots on a stamped valve cover. You can twist the nubbies off with your fingers, or cut them with a pair of scissors and it will fit on your car just fine. Don't get cork gaskets.
Kurt