Stovebolt engines in general, and 216's in particular have a nasty habit of getting sticky valve guides, and bending pushrods. An engine that's not started on a regular basis or one with stale fuel in the tank is extremely likely to have sticking valves. That can cause low compression on one or more cylinders, resulting a miss. Job number one will be to pull the valve cover, rotate the engine by hand or tapping the starter pedal repeatedly, and checking for a rocker arm with more than normal clearance when the valves close. A badly bent pushrod will be obvious- - - -one with only a slight bend will not spin as the engine idles. Good luck!
Jerry
