motor dies after it gets to temp

Yeah, my money is on the dizzy pick up coil failing.

Happened to me...car would die when warm. Wasn't so much that it was warm, such that it'd be running fifteen minutes and the pick up coil would fail open circuit due to temperature. Therefore, no spark.

This happened with a brand new zero miles MP electronic distributor. The next time the car dies, disconnect the distributor fly lead, and measure across the two contacts. Anything more than a thousand ohms, it's toast.