I was late chiming in but that was going to be my sugestion; pull the valve cover and plugs to see if anything was out of sorts before spending all your time with the starter and damaging it more (as well as other things such as the starter. The noise you mentioned was a big key.
I think pulling the head is a must. You will no doubt get an idea of how bad it is when you get to that point; damage piston, scrapes on sidewall and damage rings. Even if you find damage something you could live with I would also see about dropping the oil pan to make sure there are no loose fragments floating around. It's a job removing it (I did mine) but you can if you have the removable cross brace.
Gary
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