How about doing some diagnostics before you throw parts at it. First thing: You say it has a misfire. OK, a misfire generally involves ONE cylinder not firing every time - or firing weakly most of the time. Second: The things you are doing generally affect ALL cylinders - not just one.
Some things to go over: 1) a compression test will tell a lot. 2) Check for vacuum leaks. Around intake manifold in particular. A vacuum leak can cause one cylinder to "lean out" and fire erratically. 3) Spark plugs: By chance are you using champion plugs? If so, I can guarantee that you will never get a Ford to run right with Champion plugs in it. I'm not condemning Champion plugs al together, just that for reasons I will never understand, they DO NOT WORK in a Ford. Period.
There are some other things that can cause your condition, but then you are getting into major engine work. Items like a single broken piston ring. Or a poorly fitted piston. Or a bore that is out of round. Or a head that is built up with carbon to the point of significantly changing the CCs of the combustion chamber. In some cases, I have seen carbon built up to the point of hitting the piston at TDC and it would sound like a bearing knock.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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