pertronix upgrade?

[926bill]

Got a pertronix ignitor and coil to put on a 470 mercruiser. Do they all have a ballast resistor or wire? Do I need them if I put on a flamethrower coil? Here's some pics, two black wires from negative coil, red and purple/yellow wires from positive. The purple/yellow goes around to the port side. Is this the ballast resistor or starter solinod or what? Any help would be great,want to go fishing Monday.

BC