wrench87 Either place works. vertical with an
oil filled coil is not a good idea. I have and seen them explode on cars and leaves a nice little fires, my jeeps and car 3 times. All coils where Accells, 2
oil filled round ones and 1 super coil. You can run the wires down the same side but have 1 set of them in a silver conduit to help remove outside EM signals to the MSD box. I have the twisted ones in the conduit tube. No signal problem with the same setup for 10 years. Grounds and power are the most important things for MSD systems. 2-3 grounds for the motor and 2 grounds to the chassis and body. Heavy wire or ground straps. Rick L