Installed on 55 T Bird Y block to replace stock Holley 4 barrel T Pot carb. Had a really tough year troubleshooting an engine stalling at random times when coming to a stop. Very dangerous on Calyforuna freeways.

One year of dealing with MSD tech being told that I was doing something wrong or it was the engine. Much time spent on their forum where technical problems were endemic. All the time me telling them to fix their software.

After 3 software update/refreshes all now appears well for the most part.

Will now report that starting, idling, fuel economy are much improved compared to the miserable old Holley.

A very strong point on the MSD Atomic,,,no one knows it is there when the hood is up. I've numerous updates to the car,,,AOD 4 speed overdrive automatic,,, Borgeson steering Box,,,etc , and yet car appears stock except for the Vintage AC add on.