If you connect a spark plug to the coil as outlined on Clarks, are you getting spark? (guessing no)
Ignition System Troubleshooting
-Have you done the resistance tests on the coil?
-I was going to mention the ignition control module (down near drivers side headlight) as well, but you say you have already replaced?
-Did you check the cap and rotor?
-Correct speed sensor part number?
-The sensor at the distributor is the cam position sensor - did you test that?
-Do you have a factory alarm?
Disabled?
I would think if the ignition switch was the issue, you would not be getting 12V on both sides of the coil.
Ignition switch test
http://www.clarks-garage.com/pdf-manual/elect-17.pdf