I need some GOOD header gaskets

I use 1 gasket per side, Mr. Gasket! I also run Permatex Gold high temp sealer, no leaks yet! I have even had the passenger side header off twice, never resealed, used the same gasket, still no leaks! I was very surprised. I heard the copper or aluminum ones are junk, having good headers is a big part also, I run Hooker supercomps on my 340.