383 `68 Dart valve cover choices with ex.manifolds

I like the stamped rocker covers, too, but I can never get the gaskets to live and seal. The gaskets just get cooked. The only luck I ever had was either with a cast aluminum cover and a heat shield gasket on the exh. manifold, or I made a valve cover girdle out of aluminum plate for some chrome DC/MP stamped v. covers.