there arent any exhaust manifold gaskets on the heads , the gaskets on the y-pipe near the turbo are definitly easier to repair while engines out ,just make sure the silicone you get is made for the oil pan replacement , it is totally differet from any regular silicone , and comes in a caulking tube , i think the ford part number is yc-51, it is also dated , make sure its fresh or youll be doing it again, h and i would put the rar seal in , even though they dont leak that often , id put one in mine if the engine is out