I'm looking at putting an MSD ignition in my daily driver 78 but don't know which would be best. I definently know a 6 series is where I need to be. My 78 is running a rebuilt 355 with a mild cam. And don't know if I should go with a 6, 6a or 6al or even a 6al-2 but the 6al-2 seems like a little to much. Any help on this would be appreciated thank you!