Back in the time when 216s moved a large part of the people and goods all over the world it was common practice to rebuild them without removing the engine. There are shims on the bottom end and it's a good chance you still have some left. Possibly the cylinders are straight enough to take a light hone & new rings. Maybe even a simple lapping of the valves will get you going again. These are simple good engines built to last and to be repaired. Remember it is only "stock" once.
