Inlet manifold gaskets

I have a pair of 318 closed chamber heads with a water cross over,
casting No 2837020 ( 60 cc ) chambers and was wondering what inlet gaskets members are using? I'm not sure if the heads are an Australian specific head but the water cross over is in the same location as heads with an exhaust cross over but the opening is rectangular and doesn't have the half moon cut out.
Thanks in advance
Al.