Would having the spark outputs incorrect give you no tach/crank signal though? I feel like that would just make your coils or ignition fire incorrectly.
Some have said not having resistors will be troubles, others have said it shouldn't cause problems. When I was tracking down my crank signal issues, I put in resistor plugs as well. Ended up not being my initial problem, but having them in there now, I avoided any other problems I may have had down the road.