Rubber gasket vs. a cork gasket

When ever its time for a new valve cover gasket on my slant 6 Valiant daily driver. I take great care to ensure a clean/oil free head surface and a clean/oil free valve cover surface. I also make sure non of the valve cover holes are dimpled in from over tightening. I use a dolly or the edge of a steel work table to hammer those surfaces straight. I then will use very thin bead black rtv on the valve cover to effectively glue the Cork gasket to it. I let it sit over night if possible. Then just before I install the VC....I spray a thin layer of engine enamel onto the gasket. Helps to glue the gasket onto the cylinder head and fill any small voids. I hand tighten all the bolts starting with the centers and working out to the edges. Then use a wrench/socket for final tightening but I concentrate on even tightening on all the bolts. They do not need to be very tight. You do not want to deform or cause the gasket to get squished out from between the VC and head. I like the cork gaskets. my 2 cents...hope it helps.