Waterneck gasket info needed !

I’ve read that Real Gasket Tennessee makes valve cover gaskets too, has anybody tried them?

Yeah and not happy. I got their fiberglass reinforced one for my 170. Torqued it just like they said. And yes, I straightened the bolt holes out. I tried it at their torque spec. Leaks like hell. I tried it a "little" tighter. Leaks like hell. Just a little tighter until it JUST was trying to ooze out from under the cover. Leaked like hell. Replaced with cork. Sealed like a ****.