I'll let you in on a little secret; Ford ignition systems kick ***. No one ever wants to believe that, and thinks they're better off dropping an MSD box in, but odds are the factory ignition is better. I put a Crane HI-6 box in my '95 F150, and it slowed it down. I swaped back to the factory ignition, and all was well again. I see it all the time. I can't speak for your particular Holley system, but the factory Ford ignition is as good, or better, than most of the aftermarket pieces I've seen and installed in my customers vehicles.
Take care,
~Chris