Sounds like you have 3 like the MSD ballasts and 1 like the BWD19. I personally would not be running the MSD Blaster 2 on long road trips unless I had spare ballast and coil and ignition box to carry. The coil resistance + ballast is a mite low and will be heating things up; OK for the drag strip (like the 0.25 ohm 'performance' ballasts!).