Warren,
I am not familiar with the Superformance wiring, but on mine I had separate leads for the high and low beams. My high/low beam switch was the turn signal lever. I also had separate fuses for high and low beam. I lost the high beams once and traced the voltage loss back to the connector that came out of my steering column. If you have separate leads that you can get to, try checking the voltage and trace it back until you find where it is not getting through to the lights.
Ron
