I like to dry fit the intake with the side gaskets to check the china wall gaskets. If there is a big gap you will need the cork end seals. If the gap is small just use black silicone. A nice even bead, install the intake, tighten the bolts making sure the sealer is touching all the surfaces and walk away until tomorrow. Leave you valve cover breather caps off. Silicone needs air to cure and leaving the crankcase exposed will help that along. I used silicone on my 273 end gaskets because the heads were milled as well as the intake surfaces so the intake sat a little lower than usual.