I installed 3 6AL boxes with a Mopar electronic distributor, blew all three, spoke to MSD, they said they were compatible. They would work for about 10 seconds, than die.

Installed the old MSD unit, worked fine.

Installed a new MSD distributer with a new 6AL box, no other changes, still working. I took one of the boxes apart, it had a burnt out quad driver in it.

New best 10.18 , 1.40 60 ft 496 Scott Brown built, street driven 3600 lbs,654 hp , 653 ft tq