360 timing ignition woes

Since you had a restoration, you may have removed/moved all the wiring in the car, including the firewall connector and the connectors to the ignition switch. I'd get out the schematic (download fro MyMopar) and inspect all the connectors, and trace all of the wires involved in the ignition system, from battery through ignition switch, through the firewall connection, etc.

Make sure you have a good ground on the case of the ECU; if you don't want to scrape off new pain underneath the ECU case, then apply some star washers to complete a good ground there. Same applies to your grounds from battery to engine and to body. New paint can mess all that up.

This may not be the issue, but you don't want erratic electrical connections, and the restoration has some potential to cause that.