Best Valve Cover Gaskets Available?

I put the Mopar perf grey steel core gaskets on my 408 when I built it 3 yrs. ago. It's a solid cam engine so I have to adjust the valves every so often and each time I take it apart the gaskets look just like the day I installed them new and they seal fantastic. Not even a seep. I'd bet by the description their very similar to the Moroso gaskets mentioned above. Got about 7000 miles on it now and I'm sure I've had the valve covers off at least 7-8 times.