2005 Pacifica intermittent spark/stating issue
 

I have an 05 Pacifica I need some help with. We just installed a new flywheel and starter and now the car won't start. It turns over just fine but it only has intermittent spark. I pulled the crankshaft sensor and it seems to be rubbing on something because it has some scuffs and scrapes on it. I put a new one in and it happened to the new one too. I've tried to shim it with a piece of match book and a thin washer and still no luck. I don't think the car will start if it's making constant contact with whatever it makes contact with and what could it be making contact with to be making the scratches on the sensor? Any help would be greatly appreciated