Are you talking about the pickup coil in the distributor? Is that something that can be bad and only fail when car is warm and has run for a while. The restarting the car when hot and having no spark has been a solid symptom for a while.
You bet. All it takes is an ohm test when its not firing. You be looking for 350-550 ohms.
I would expect its open or shorted when hot.just throwing parts at it gets expensive. But its not like i can stop by and help you through this. Much as i would like to.