I had issues with the injector wires. The rubber boots get hard with age and can rub through the wires causing a short. Had this happen a couple times. Dr. Tristan helped me find it at the track once. Showed up as a miss in the motor. Sounds like you've gone through and checked all the connectors, though.

You said the motor is hard to start? Mine fires right up once the fuel rail is primed. Have you checked the fuel pressure just to be sure the pump is ok? Maybe a faulty fp regulator? Might replace the dist with a known good one just to rule it out. I've read of some issues with the dist having problems when hot, but I've never experienced it.

As an aside, I have no idea how my car ran with the wiring harness it had. That thing was so rigged I'm surprised the car even started. The harness in the new tub is near perfect.

David