very weak spark

I just bought a 66 273 dart. It wont start and I checked the spark. It has a very very weak spark when I remove the wire from the coil to a ground. I checked the points and they are breaking. Ive exchanged the coil with a good one from another vehicle. Could a condensor be the issue. I have currrent to the coil and the ballast is good. Where do I go now? I realize it could have jumped time but shouldnt I still have good spark?
Thanks
Rodney