Yes you will need a Vortec specific intake gasket, and not just any gasket. The Vortec intakes are prone to leaking. This is the one you want to use, even though it comes with pieces you don't need. This is the best latest updated Vortec intake gasket.
http://www.jegs.com/i/Fel-Pro/375/MS...oductId=746656
The valve cover gaskets are not Vortec specific, they are just '88-'02 Center bolt valve cover gaskets