valve cover gaskets

You didn't mention if you have 1 or not but no gaskets will stop it from leaking if you don't ave some sort of good PCV system. And breathers alone won't cut it. You need something to draw the crankcase gasses out. Otherwise the pressure will force the VCs to leak(among other seals).
I have valve cover gasket leaking issues too. Mine are leaking in the same area on both sides of the engine. That would be above the 5 and 7 plug and the 6 and 8 plug. Oil is leaking out between the head and the gasket. I am going to try the Moroso gaskets and see if that helps.