I checked out the Arias pistons, and they look really nice, more similar to the Wossners than anything else. I plan on working on the build with my friend who is a master tech and who has built several engines for his personal cars. Or maybe I'll just continue to properly maintain my car and run a safe tune. Now I'm back on the fence...
The OEM head gaskets are fine for a build like mine, and yes, both gaskets are the same. Haven't looked at our OEM headgaskets, but most say "this side up".