Gasket, Intake Manifold Valley
#11
You definitely have a plug passenger side valve cover breather tube. It is possible to remove the entire tube from the valve cover by gripping it with a pair of pliers and twisty until it comes out. You may want to remove the valve cover anyway so that you can replace the gaskets as they are probably old and hard and prone to leaking as well. If you have a no 3/04 truck be sure to remove the restrictor plate from the top of the breather tube before you reinstall it
#13
#18