I wanted to replace my valve cover gaskets both front and rear this week because i believe that is what i am leaking a lil oil from and i was wondering if i should replace anything else while im there. Do i need a new gasket for the intake manifold? Does anyone know about how long this should take and if any of you have had any problems in doing this -like breaking bolts because they are rusted in there or anything. Also does anyone have any tips or tricks for this or is it just straight forward