MSD blaster 2

1970 Duster, 340 with electronic ignition, orange box 4 pin. I got a two pin ballast, picture below. I got a MSD Blaster 2, 8202. Question I have is do I need to add another ballast per the MSD directions? If the answer is to check the ohm's on the ballast, how do I do that. Between the two pins? Wire colors may not be correct, but they do go to the correct connections.

Second question, It appears my ignition now is wired as per Mopar electronic distributor directions. Except I have a capacitor or something connected between the coil + and ground. What is this for, and do I need it? Pictures below.