Well.... I removed the original Autolites at 195,000 miles and 6 of 8 still looked good. I put Autolites back in, don't expect to change them again.
Probably the Falcon had the old distributor system, not the "waste spark" one that reverse spark on 1/2 cylinders.
Googling seems that Falcon '93 it still had distributor in Australia.
Like I said, distributor ignition systems are not reverse spark... only the distributor-less ones.