I had intermittent dying on my engine too. I would be driving along, it would cut out , then come back on. Sometimes shut off then I'd have to restart. Pip sensor inside the distributor was going and when the distributor was pulled Rick noticed that the bottom of the distributor where it turns the oil pump shaft had started to crack, that was an MSD distributor. Replaced with stock Ford distributor and new Ford Pip and no more issues. TFI was fine.
New Ford TFI from a Ford dealer is $300+. Same Ford one from Rock Auto is about $160ish