I was running my car in an autocross today when the engine abruptly quit running. There were no unusual engine noises, but it would not restart. When I got it home, I discovered that the distributor shaft does not turn when the starter is spinning the engine. I've never worked on a Ford engine before, so I need advice on how to methodically determine the root cause of the problem (e.g., drive gear, cam, timing chain, etc.). What do you guys suggest?