the pictures posted won't give much of a clue as to the cylinder wear. Pop the valve cover while it is running and look to see of there is any obvious cam wear. To rebuild the head, do a search here or on the hamb and you will get tons of info. Those head questions are awfully broad questions for a general "how should this be done" post.
By the time you are talking cam swap and cylinder head overhaul, you are most of the way into a major rebuild, in my opinion
