No Spark - I'm Heading For The Rafters With a Rope

Hi Folks - Here is my issue. My 70 Dart was in a million pieces. I have since put it back together, new (used) 318 motor, the works. New Year One engine harness and existing dash harness. Was a points car but bought all the electronic ignition stuff and the year one engine harness is modified from the factory for electronic ignition.. Here is my issue:

I've got it so when the key is turned to "on" there is 12v at both the + and - side of the coil. There is no power to the doo-hickey wire coming off the distributor. Everything is wired properly as far as I can see (I'm sure something is wrong, hence my problem). When the motor cranks from turning the key to start, there is no spark coming out of the top of the coil and obviously no spark going to the plugs. I have replaced the coil with a known working coil and the wires are all new...

I don't know where to look now... Please help - this project is killing me!

Eric