On my tunnelport I glued the gaskets to the manifold with Permatex black adhesive sealant,
oil resistant,and let it set up for a day. I then put a bead of the same sealant around each port on the head.This worked for me even though I had to move the manifold a bit to get everything lined up.Previously it sucked
oil in the number 6 intake port so bad it would foul the plug.Now I drove all summer,used no
oil and the plugs stayed clean.