MSD 6AL or AL-2

The digital boxes require fancy shielded wires that cant be within 6" of any other powered cable.... they will tell you all kinds of BS to explain why it's causing issues...

The problem we have with the race truck when we put the digital 6 box in was you would set the timing, run it all day, leave it overnight and the next day the timing would be out 10 degrees... reset it and it would be fine, leave it overnight and again 10 degree timing change... Unless some timing fairy was coming in and moving the dist overnight...