When you remove the upper intake you have to unbolt the EGR valve from the intake. The throttle body is removed to gain access to the EGR port behind the gasket. (my 115k mile engine I put in my SVT had never been cleaned and was plugged).
So you need upper or upper and lower gasket kit.
EGR gasket and throttle body gasket.
If you havn't done a tune up in a while the plgs and wires will be easy to get to at this time. Remember . . If you spray cleaners into the intake ports you can flood the engine with cleaner and you might have to crank a while the first time you start it after cleaning.