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I don't recall having to loosen other bolts when I did the cam swap in my Mustang. It should come right out without having to jack on anything. There is going to be gasket material that seals it but try using a small pry bar or screwdriver and breaking it loose around the edges first.
Cut the rubber seal off and use the tabs from the timing cover kit. Make sure you use RTV in the corners and the yellow "hi-tack" for the cork tabs. I would use "Great Stuff" for RTV. I've never had that stuff leak on me.