1997 Dodge Caravan 97 Dodge Caravan won't start

I have a 1997 dodge caravan. It was running fine and we had to replace the engine due to a knock. Since replacing the engine it will not fire. I have checked to make sure all ground wires were hooked up and prior to installing the engine I made sure the tone rings on the flywheel for the crank sensors matched up. I have replaced the crank sensor and still no fire. The crank and cam sensors are both getting voltage but there is no voltage to the coil. The only other thing that happened is the knock sensor was broke during installation but as I understood that shouldn't prevent it from firing. I am really stumped at this point and any suggestions would be greatly appreciated. Thank you for your time.