hey guys,
ok, I'm upgrading my ignition soon, I'm gonna get msd 8.5 wires with msd distributor cap, and also gonna get the blaster coil but I'm un-weiry about which blaster coil I should get. the choose are

MSD Blaster Coil 2:
http://www.inlinefour.com/msdblas2coil.html

Or

MSD Blaster Coil 3:
http://www.inlinefour.com/msdblas3coil.html

I don't know to much about either of them, or in matter of fact what they do, but I know I want to replace the whole iginition and need some imput, so if you know which does what, or what I should get for better performance please help me out.