I have an 85 with a 305. I replaced the valve cover gaskets with new neoprene ones, and they are either melting (they pretty much touch the exhaust manifolds) or I'm still leaking oil. There's a noticable amount of blue smoke when I shut it off. Are there any better gaskets for these things? one of the studs may be stripped as well, can these be backed out or are they permanant? Any tips and tricks appreciated. "who dares wins"