Oil leak under new manifold.

I did a 2-4bbl upgrade on a 318 using an Eddy Performer manifold.
I was told by many web-buddies & Edelbrock’s techline to NOT use the cork end gaskets, just use a good bead of Black Permatex. Well I did, and now it’s leaking (not bad but bad enough,worse under load). How can I stop this without re-pullung the manifold? Can I force some more Permatex (or a stickyer product) into the seam? I need to know if anyone has actually fixed this problem successfully. Thanks