My '68 was not starting (no turn over, no noise as though the ignition switch was defective). So I replaced it along with the Starter solenoid. Started fine for a few days then yesterday I stopped at a stop sign, heard a click and the engine died. Started right up afterwards. I checked the wires to the coil, and the wire to the distributor. Is the only other likely plan to get into the wiring harness and look for problems there? I'm stumped and want to avoid a towing bill. Thanks.