Has anyone had favorable results with this engine? I had no almost compression after about fifteen gallons of Magnum 20/20 fuel. This was resolved with replacing the cylinder head and valves. Now I've got compression, a reliable idle and mid-range. My concern is that the engine runs best at only one turn out on the needle and I still get only about 8500 rpm with an APC 14X10. Any thoughts?

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It doesn't really matter where the HS needle falls as long as the engine is set properly. 8500 on a 14x10 is low but is can easily be affected by weather. You might check to see if the valves are too tight. Set them both at .003".