This is on a 68' Barracuda 410 with Mopar orange box that I just put on. I had the MSD 6AL Digital system on . I did all of the test from info online for the MSD and it proved to be bad. Put the orange box with Mopar distributor and I'm having the same issue,,, no spark at all. Battery good, ballast resistor test good. Maybe distributor not grounded good. I'm sure it's something simple that I am overlooking.