New Head--No Spark

My sons 97 Stratus, 2.4L, had a bad valve so we replaced the head.
When we went to start it, there was no or a very weak spark.
I checked all ground connections as well as all other connections. The plugs and wires are new. Please Help!!!!!

Check the coil terminals and see if there is rust on the tips where they go into the the spark plug wire if thats OK check the ground straps that should go to the passenger side rear of the valve cover and to the strut tower. Otherwise its probably a bad coil pack.

RG