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You are obviously using small block Ford heads. Some aftermarket heads have the bolt holes for the valve covers tapped to only 1/2" whereas stock heads are tapped to at least 5/8". In the valve cover adapter kits I sell there have been some reports of problems similar to yours caused by the bolts being a little too long causing them to bottom out before attaining a good seal with the cover and the gasket. Rather than repost instructions here, click on the link below to my ADAPTER page and click on ADAPTER INSTRUCTIONS. You will find detailed instructions on how to solve this problem. Also, placing a "ring" of silicone sealer around each bolt before tightening them down will usually prevent oil from seeping out around the gasket and the bolt. Good luck.
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Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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