Poor Spark?

UPDATE:
So I came home tonight and checked compression in the cylinders. I have compression so I check the distributor leads and switched them again, and it sounded much better.

I cranked it over and it started but as I release the key it turns off. I had this issue prior to doing the engine swap and it was recommended that the ignition switch was bad. The donor car ran fine and the ignition worked as it should. So I removed the ignition switch from the donor car (74 dart) and installed it in the 70 Dart but now the ignition is doing the same thing. When in the run position it kills the engine but when in the start (starter engaged) or turned forward almost to the starter is engaged it runs.

So I think switching the distributor wires helped it fire but I still have another problem.