MOPAR ECU Gold Box

Many years ago I put a Mopar gold ECU in my '71 Dart.
It lasted exactly one run. I barely made it back to the pits.
Mounted it in the coolest place possible with proper grounding, but it still crapped out.

Just a small 'Maybe' it failed because of wrong ballast or coil (MSD blaster 2).
Can't remember what ballast I ran that day.

Swapped over to a Chrome box and was able to do more runs that day.