i replaced both valve cover gaskets earlier this year. my leak was mostly on the pass side. i used toyota gaskets. i also replaced the cam seals. you'll need the plenum gasket too as that has to come off to get to the valve covers.

now i am facing a headgasket repair and i can tell you there isnt an oil leak. there isnt any oil in the coolant either. just blowing a little smoke during engine warmup.