Still messing with this, Mark? I assume you've made or procured a new woodruff key? The point gap should be around 0.3mm. Basically, the thickness of some cereal box. Place the cereal box in there when the point are at their most open position and tighten down the point screw. Should set you pretty damn close. I have also attached some mechanics notes specific to the M56. They go into great detail on timing these engines.