I appreciate all the help and the honesty, Brad.
Jerry, I've taken a while to cool off and think a bit. I agree there's still a few thinks to check before pulling the engine out. From your advice, it sounds like your money is on there being a problem with the rings. I will put some Marvel Mystery Oil in there tomorrow and let it sit for a while. How much should I put in each cylinder? A capful?
Any tips for getting the valve cover to seal better?