Can't start, no spark getting to plugs

If you have spark at the coil, do you have it at the cap from the coil wire? If you've got nothing coming out of the cap then the problem has to be in the cap or rotor. Make sure the rotor isn't allowing the current(spark) to pass through it &ground out on the distributor shaft. Look for any signs of burning on the bottom as well as the top of the rotor. Espescially in where the rotor fits over the shaft.

Reading your post 1 more time made me think/wonder if its a bad ignition switch or the circuit from the switch. It may be getting good voltage in the starting position but losing it when the key is released to the run position. But I may be confused as to what you're trying to say. Tell us more how/ what method you're using to check the spark.