When I mentioned the F-4 project that was killed off for the F-16, I may have been in error. The proposal I was thinking of was the F-4X, a high-performance variant for Israel with speed similar to the SR-71 Blackbird, and offensive capabilities beyond anything currently in the USAF arsenal. Water injection was projected to give the aircraft a top speed in excess of Mach 3 (over 2,000 mph (3,200 km/h) at high altitudes). It was forced to be modified for reconnaissance use, then finally scrapped, for fears that a high-performance Phantom II would endanger sales of the F-15 Eagle (rather than the F-16 as I originally stated)
A separate IAI project was also proposed, centered around the F-4 Phantom. This Super Phantom project was separate from the Boeing Super Phantom proposal. The IAI-made F-4 "Super Phantom" or F-4-2000 was demonstrated at the Paris Air Show in 1987. It could exceed Mach 1 without afterburners, making it the first aircraft in my knowledge with supercruise capacity. McDonnell Douglas scuttled Kurnas 2000 development because it equaled the F/A-18C/D in performance and endangered any future sales of the F/A-18. One prototype was constructed.
Source: Wikipedia
Sorry for any confusion.