MSD Coil difference

MSG=Monosodium glutamate.
MSD=Multiple spark discharge.
big difference.
sounds as though the blaster III would be the one you want since you are running a MSD ignition.
Blaster III Coils (Blaster 2 - PN 8202, Blaster 3 - PN 8223, Blaster 2F - PN 8205) can be used in stock applications, but do not include a ballast resistor. When you are using an MSD Ignition Control, the Ignition is responsible for delivering the voltage to the coil so a ballast is not necessary.

The following Blaster 2 Coils ( Blaster 2 - PN 8200 and Blaster 2 - PN 8203) are supplied with a 0.8 ohm ballast resistor and a terminal and boot to fit most applications. The ballast resistor must be used with stock Points Ignition and Mallory Unilite applications.

I have been told not to buy the blaster II coil by some guys online here. not quite sure why but i am running a blaster II myself.