MSD analog relibility; any ideas?????

It should be easy enough to leave the mopar ECU in place and with a couple of quick connects be able to swap from the MSD box to the mopar box if it were to fail again.

After taking a quick look at the installation instructions I don't believe for a second that the Accel Coil caused the unit to fail. It could have been a manufacturing defect or a faulty component. I wouldn't worry too much about it crapping out again. In a previous life I was a Reliability Engineer and and based on my knowledge of the types of parts used in the analog MSD products this type of product is extremely reliable on the order of 500,000 hrs on average between failures.