Anytime my car had a hiccup or misfire it was always MSD box related, I went through a few Digital 6 boxes over several years. I only had the one coil die and it was a NO FIRE and not a misfire problem. I ejected all the MSD stuff from my car when I went with fuel injection and have enjoyed the reliability.

I wouldn't discount that ford coil as not having enough spark if that is what you are worried about. The later model cars have some pretty hot coils on them. I know chevrolet also had a coil similar to that ford coil that could support some pretty decent power.