The Cyclone started out in 1964 with two engine options: the 210 horsepower 289 V8, and the very rare 271 horsepower Special Order 289 V8.
By 1966, the top engine option was a 320 horsepower 390 V8.
For some years, a Cyclone GT was made available. The GT version got the bigger engine, different stripes on the body, and a higher-end interior including bucket seats.
At some points in production, the high end Cyclone was paired with the top engine Ford was making at the time, the 428 Cobra Jet. These cars are called the Cyclone CJ.
One variation on the Cyclone was the Cyclone Spoiler, which got rear and front spoilers in addition to its top end engine. By 1970 this was a Ford 429 V8.
Whether equipped with a 351 Cleveland, 428 Cobra Jet, 429 CJ, or 429 CJ Ram Air, the Cyclone is a desireable car for collectors. Some models may have also received some of Ford's special edition engines such as the 429 Thunder Jet, 429 Police Interceptor, and 429 Boss that was becoming a hit with the Ford Mustang.
These cars are not easy to find. The best prices can usually be found on eBay. I see some really nice Cyclone project cars listed on there on a regular basis. There are also lots of parts for fixing them up.