So, I need new header gaskets for my P heads. I'd like to do copper if i can. Looking on Summit, they seem to just offer header gaskets for any SBF when you put the Explorer application in there. And no copper. But these don't seem to match say the MUSTANG header gaskets that something like LMR has. So, I'm confused. Will header gaskets meant for E7 heads work on GT40P heads or not?