Troubleshooting my car! help make it run!

Have not been following lately. Did you ever change the pick-up coil in the distributor?? I know it was suggested. Do you have a ground strap to the firewall from the engine?? Heat increases resistance to the point that ignition components fail to operated correctly. Everything you say points to a heat soak problem. What gap is set on the pickup coil to the reluctor? Once again, if the pickup coil is weak, that gap becomes more critical. Oh yeah, change the pickup coil.