I got a Crane HI6 thats damn near 30 years old with a 3 step. Has to be the most reliable ignition box I have ever owned & it even starts the car when the battery is low. Shame they dont still make them.
I have ran Crane boxes on several different projects over the years. Never a failure unlike the MSD crap. The one on my Cuda today I bought used for $100 15 years ago. I see them for sale on the 'net every once in a while. If I were still building projects, I would grab every one that came along.
