Ignition or Fuel?

I had fought an intake gasket leak before, and I am not sure that it is cured. I had problems getting the port surface between the head and the intake to seal. The first intake I had for this new motor was brand new, but it had a high spot in the port surface and it wasn't square from front to back. The new intake seems correct that way but I still fought a leak. I had some oil showing up about half way up the gasket surface from the lifter valley side. The new intake came back off agian after having a lifter go bad and wiping out a lobe on the cam. This time I put silicone down lightly on both sides of the intake gasket and went back to using an all fiber gasket (no metal laminent). The plugs are not wet with oil, but more of a dry black film. That is why I believe it's not oil fouling. I'm not saying I know for sure though. The intake sealing issue has everyone I talk to puzzled. I get a good crush pattern on the side gaskets, even when I knew it was leaking.

I've had my Dart since college. Since she's F5 green with a white stripe we started calling her the Green Hornet.