MSD Coil replacement

Thought I would call MSD and get their opinion on this subject. I was told by MSD that the coil (blaster 2) could be mounted either horizontally or vertically with stock ignition. However,with a MSD ignition he told me to mount it vertically because the MSD ignition would cause more heat in the coil itself. So I guess I will go ahead and install the MSD coil and mount it vertically if possible.......Thanks for all the good info.......always learn a lot from this forum.........Thanks again