I have a 95 f250 351, it will run for about 30 min then stall, after 2hrs it will start right back up. I have changed the coil ignition mod and new dist. still same issue, any ideas for this?

 

Check for fuel pressure at the rail after it stalls again.

 

Had a Bronco at one time would do that, and it turned out to be the fuel pump. I would get hot and quit then once it cooled off, it would start back up as if nothing happened.

 

Yes you need to do some checking of fuel pressure and ignition during that time when it won't start. My guess would be that you got a distributor with a bad PIP in it, rebuilt distributors have a terrible reputation. I assume you got a rebuilt distributor, as I doubt if you could find a new one.