Ballast Resistor with Aftermarket Coil and Igntion box

I converted our 1957 Desoto over from points ignition to electronic ignition. I put together my own ignition kit using a Mancini ignition box and an MSD Blaster 2 coil. Right now I have the ballast resistor that came with the MSD coil wired in. In the description the ballast resistor is supplied for use with points ignition systems. Do I need the ballast resistor using the Mancini ignition box and MSD coil?