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You can try a crankcase vent to see if it helps as it's a possibility. I kept leaking rear mains road racing until I went with a baffled oil filler breather I install on track days. Now I get maybe a drop or two on the trailer because I'm not replacing another seal until I do a clutch at the same time. Get a machinists grade straight edge and check pan and block for trueness, a shop may let you borrow one if you bribe them with beer. Many people use something abrasive to clean the gasket areas and dorm them up. Doesn't necessarily hurt to use a sealer as long as you don't go hog wild and use a few tubes worth. What oil pressures are being seen at idle and cruising? Did you use the high volume or pressure pumps?
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