I don't trust my 6AL box. It failed on my car within 100 miles. It was just up the street from the house and neighbours pushed me back to the garage....
So, every time I go out, in the back of my mind I am wondering if the MSD box is going to crap out. Many say - keep a spare in trunk. But these units are $400 or more.....
My poor experiences have me leaving the OE or MP upgraded wiring in and ready to go at a moments notice in case of a MSD failure which has always happened to me. 1 great box, a dozen gaggles of garbage boxes.
When the MSD stopped working, it was a simple unplugging of the two wires to the distributor and then reconnecting them to the Chrysler box wires. Done! On my way again.