the inside of my 216 looked like that also, i just cleaned it up a little degreaser and a vacuum didnt take long. i also pulled the pan and cleaned that up also along with under the valve cover. just make sure to oil it up well after cleaning. the reason they get so dirty is the breather system and lack of a full oiling system. that is why most guys go to the 235 full pressure oiling and no babitted bearings. i agree with you that the 216 is a cool engine that why i am going to triple carb mine with a split exhaust and hook it up on a stand so i can run it on occasion. just like the old hit and miss gas engines of yester years.
