Hey cobradude I use a billet MSD distributor, 6-al box, and crank sensor. My car has Fuel injection and needs both signals for the brain to work, both retard and advance the timing. I had a poor ground and let the smoke out of a 6-AL box, sent it back to MSD and they repaired the box for free, minus shipping. Great company that stands behind their products. Good tech line also. Rick Lake.