Best valve cover gaskets?

I've had better luck using cork gaskets too. I install them the way Johnny said, glue them to the valve cover.

I just used the Mopar metal core gaskets on my new 408 with Iron Ram heads and they seem to work well so far (fingers crossed). I'm not so sure they'd work great on LA heads (if that's what you have) as the valve cover surface isn't machined on them. It's as cast.