Stop in for a cup of coffee

Ordered 2 of the epoxy filled coils, I have the regular blaster 2 mounted on its side, and supposedly that is a no no. Will replace it with one of the new ones, keep the other as a spare..
That actually has me wondering what the difference in the MSD and pertronix are.. electronically? I went with a OEM dist curved and pertronix ready to run.. not near as shiny though