it seems they suggest a ballast resistor for street use....hard for me to accept buying a modern ignition system that must have a ballast.
It's a 4-wire unit, so it does not rely on the ballast resistor to power the ECU. The resistor is only for the coil, if you use a coil which does not require a BR (ie one which has the resistor included in the primary windings), you don't need one (that's true for any 4-wire ECU).
It's funny how with the OEM resto crowd, no-one has come up with a 0-Ohm resistor yet... That would be the best way to have a stock-looking setup, OEM harness, and use a MSD Blaster 2 or whichever coil you want.