Gasket Dilemma

With cork gaskets, you have to make sure the sealing surfaces are flat and sometimes use a ball peen hammer to ensure the bolt holes in the pan are flat and not pulled up toward the block. Get the surfaces flat and clean. Then apply a very thin bead of your favorite RTV sealant, gasket shellac, or my personal favorite is Permatex Aviation Sealant. Use any of the sealers very sparingly, you don't need much.
DO NOT OVERTIGHTEN the bolts. 80% of oil pan leaks can be traced to over-tightening.