voltage on the ballast res

This is a new 69 motor in a 62 valiant and I doing the first start up with the new power plant Also I've never had this car running nor have I heard it run I've went through the wiring and fixed what the previous owner had messed up.

The problem I'm having is with the key in the run position I'm getting a 10 vdc reading on the incoming side of the ballast res and about a 5 vdc reading going to the coil and my spark is weak
Are these reading what I should be seeing or should they be closer to 12 vdc I'm charging the batt now I was think possible I low charge on the batt
Anybody have any ideas
Aaron