Leave the rubber end gaskets out. The best thing you can do is throw them away! I put sealer around the water jackets and run a 1/4-3/8 high bead where the end seals go. Let it set for about 15 min, set the intake straight down (meaning don't slide it around)and bolt it down according to the torgue specs. Gas will eat the permatex up that's why you shouldn't use it around the intake ports.