well in my setup
i have a msd 6a with a blaster 2 coil, msd wires ( i think 8.8 ), ngk plugs
how its connected ... the two thick wires on the 6a = battery cable, black = ground, i grounded to chassis, the positive to the battery
then the two wires that go connected to the blaster coil, those you have to connect to the pair on the 6a and then run wires from twoothers to the blaster 2 coil and that should wrap things up, its just time consuming because i have my 6a box on my battery side and my coil is obviosly on the driver side where my stock was located.
running the wire, wrapping it up in electrical tape, routing it the right way making sure my electric fans wouldn't hit it .. and i made 410rwhp on low boost and 524rwhp on high boost
only hesistatiion i was having on the dyno was due to my greddy profec b 2 ( digital one ) because the limiter and hte boost were having problems so we just turned off the limiter and it was fine and eventually came the point where either the fuel pump or injectors were leaning out and stopped at 524rwhp
EDIT**
i remember that i used the diagram on back of the msd 6a box, i know you dont' use a wire there if you aren't using someting.. i know if you read the instructions you'll know what i mean