Sounds like you are talking about the little cover for the PCV system. You can try and tighten it a little more, but I suspect with the age of the gaskets it might be time to change them. Go with Felpro...they often have the foam rubber gaskets which will seal better than the cork, but then again we have successfully used cork for the lat century with great success.
Oil pan gasket is about the simplest oil pan you will ever change. It is one piece of cork...no rubber crank seals involved. Shouldn't take more than 45 minutes on a slow day.
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