Welcome to AF!!
You will need the upper and lower intake manifold gasket set. Along with a set of valve cover gaskets. Check with the store when you go to purchase the gasket set. If you tell them what you are doing they should be able to help you out with everything you need. Also, don't forget fresh oil and coolant as you will need both if you pull the upper and lower intake manifolds also this would be a good time to change the thermostat.