Okay, I know it's a little older, but check this out:
Quick history lesson. Summit Ford in Kansas City was a high perf. oriented dealer and as soon as the new 5.0 HO engine came out in 82, they immediately started modding them with 4 barrel carb conversions, bigger cams, and even ball-drive Paxton blowers. By 83, the idea had coalesced into a series of packages, Stage I, II, and III. I and II were a series of bolt-ons, but the Stage III was a different animal altogether (emphasis on "animal"
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The engines were pulled and sent to a local speed shop where the stock pistons were trashed in exchange for forged, domed TRW slugs which bumped the compression up to 12:1, the heads were ported and oversize valves installed, a big solid lifter cam replaced the stock stick (not 100% sure on brand, but I've heard Iskenderian), and a non-emissions Holley was perched on the factory aluminum intake. The smog was ditched, long tube headers and a home brewed ram air kit were installed and the whole mess was topped off by a water-meth injection kit and MSD ignition system. The package was good for low 12's on the stock tires, and 11's on slicks (and remember, this is 1983.)
Only 27 Stage III's were ever built, and at present there are two documented survivors. One is a GT hatchback, the other is the loaded GLX convertible pictured above. The convertible was ordered new by an Overland Park surgeon and Porsche collector who liked the styling of the Mustang and thought that a Stage III vert would make an entertaining driver and save wear and tear on his Turbo 911's. As it turned out, though, the Mustang was more car than the good Doctor was used to, and a much milder engine was swapped into it. Even so, the Doc only drove it once or twice because, as he said, it was insanely fast, so much so that it was more scary than enjoyable. It rested for years amongst the Porsche's in his garage, and is an extremely low-mile time capsule. Likely the only one of it's kind ever built.