That 220 special was a great engine in its time... I loved mine...
Best to get that YMIS module (computer) from the guys that offered... Best keep that motor as it came out of the factory... If you really want to convert to mechanical advance, you only need to replace the trigger and add the linkage just like a 200... Stator, powerpack and coils are the same except for coil mount location... I think if you remove YMIS bracket, you can still mount coils to exhaust cover...