I have used the one peice felpro mark IV gasket with no luck on a milidon pan. Last year I used a fiber Mr. Gasket and had pretty good luck. I have also noticed I had a better long term seal if I loctited the bolts. I had to use quite a bit of silicone on the outside edge of the pan lip. If I were to use silicone I would use the permatex cheese wiz style tube called,
"The Right Stuff".