Are you getting good 12 volts to the coil? Have you tried replacing the condenser? You could disconnect the condenser to see if it's shorted. What about the gap? You won't get spark until the points open. Closed points charges up the magentic core with energy and when the points open, that lets the field collapse and cause a spark across the plug. If the points don't open circuit (for instance shorted condenser or lost gap) the field can't collapse and there won't be a spark. Check the points for corrosion too. The points need to close to charge the coil's core and then open for the energy to discharge into the plug. You are so close to running, since you know there's no spark. This is an easy problem to fix.