HELP!!!! New MSD6AL hookup instructions not clear

I have the instructions for the unit and they are not clear on a few points.

1. The Mopar Performance distributor I have has an orange and a black wire coming out of it for the pick up. The hookup wires from the MSD box for the hookup for this are purple and green. Does it matter which wires go to what color?

2. The instructions state that you :"can" install a ballast as if were an option and not necessary. Do I need a ballast at all? If so what resistance .25 ohms????