Possibly ignition? What kind of set up does he have? I've had coils and ignition boxes do that to me before

No, my msd 6al box took a crap on me.... twice. And one blaster coil took a crap...

did you replace it or repair it?

did you replace it or repair it?

Replaced both, MSD has a very good warranty, I went with an E-Coil after that though

Heres a stupid one, are/is the fuel tank(s) vented, could be getting under vacuum if not...could just be running out of fuel, had one kick my in the late 90's that had a kinked vent hose and would run for around an hour, then would die and not restart, open the fuel fill (sealed) it would suck in air and away you went again, for about an hour.

GT

just never had heard of one, whats it look like, a regular coil and is it supposed to be a HP coil   Just curious, cause if I have another prob again I may go that way

cool thanks for the info 

If it's a stock engine with a cast intake it may well be a vapor lock.

 I would pull a plug wire off the distributor and verify spark or not when it was dead. 

 Next check for fuel.  My CV23 with a 460 was sucking the fuel line shut on the tank side when the hose had some age on it and the engine compartment was warmed up.

These would be the easy things I can think of...  are you talking electronic or points ignition??

I really doubt the coil is the issue, that would be to easy and they're pretty darn dependable.   If you take a spare along and just plug it in when it died you'd know for sure.

Just my 2 cents from ford experiances