Oh boy problems...

Hey guys I need some advice. I have a 66 dart with a 360. New summit electric ingnition, new wire, new plugs, msd blaster 2 coil. I'm not even totally sure this is a electionic problem but I will be driving down the road and all of the sudden my engine will just shut off. No warning or anything. Almost like it just looses power. When it does cut off it's kinda hard to get it started back up. Takes a few times to get it to fire off. I thought it might be the ballast resistor and changed that the other day and it didn't help. I really have no idea what it could be. Anyone have any sugesstions?