I am getting ready to pull the heads and barrels off 76 shovel. I am taking them down to get the valves checked and the barrels looked at. I know that I have to replace the rings and valve guides. What else would be good to do while having this work done? Oh , I also have to get the spark plug holes redone. What is it that helps the rockers to quieten down? Any suggestions would be appreciated. I don't want to do any high performance work. Just get it back in good condition like the Good old Hog it is.