Best 383 valve cover gaskets to stop all the leaking

AndyF said
Yeah if the headers are close to the gasket then that will kill them quick. I had a car like that once so started using the Mopar motor home exhaust gaskets. The motor home exhaust gaskets have a built in heat shield that protects the valve cover gaskets. It doesn't totally solve the problem but it helps the gaskets live for a year or so rather than just one race.

Here is a picture of the motor home gaskets. You can see the shiny foil on the other side of the exhaust manifold. It is just enough to reflect the heat from the manifold away from the valve cover and valve cover gasket.