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Barrett-Jackson in Scottsdale (the big one) is happening this week. Big money and even bigger egos combine to find new homes for some of the rarest muscle machines in America.Mustangs are always well represented and 2016 is no exception. These are the Top 10 Mustangs we'll be keeping an eye on over the next week:This '69 428 Super Cobra Jet Mach 1 is a factory R-Code car complete with Ram Air Shaker Hood. Other option boxes ticked include Drag Pack, power steering, brakes, tach dash, AM/FM and tinted glass.The car isn't all original however, the 4-speed has been upgraded, a MagnaFlow SS exhaust has been added and most significantly the color has been changed to Shelby Yellow. Which is really too bad as it was a one-of-one car before the paint job.With all the Mach 1's and Boss 302's of this world it's easy to forget that the Mustang has always appealed to a non-performance crowd as well.This Powder Blue '66 comes with many rare factory options: 289ci V8, a C4 automatic transmission, factory air conditioning, power top, power steering, power brakes, Rally Pack, Pony interior with décor group and steel styled wheels. All paint, engine and trim codes are numbers matching.When the Mustang turned 20 Ford produced a special GT350 anniversary car, this one in particular has less than 20 miles on the clock. It has the desirable 5 speed and 4V H.O 302 V8 combo.Of the 5,261 anniversary cars built only 587 were convertible and only 282 of those were ordered with a 5-speed and carbureted V8.This '93 Mustang Cobra is as close to factory fresh as you're going to get. It has 3,558 original miles and is still wearing its original Goodyear Eagle ZR45 tires. The only thing not original is the recently replaced battery.We've included this one for the novelty and craftsmanship. This '68 custom is called the "Mustaro" as it blends the sportiness of a Mustang with the utility of the Ranchero. It's motivated by a 351ci V8 with a C6 automatic transmission.A true original one-of-one car ordered with going fast on the brain. The factory R-code with Cobra Jet and Ram Air Shaker Hood also has factory W-code Super Jet, 4.30 Drag Pack and was a special ordered radio delete car. C6 automatic gearbox and factory tach option go along with rare Pastel Grey paint.In 1969 only 10,130 Mustangs were built with 428-4V Ram Air engines, from that 4,277 came with C6 automatics. 76 of those were painted Pastel Gray, 51 of 76 had Black Mach 1 Bucket seats. 12 of 51 had 428 Super Cobra Jet engines, of which three had 4.30 Traction-Lok rear axles. This car is the only one with no radio.This Lime Green Metallic GT350 is a numbers matching, totally original car. It has 30,000 miles on the odometer, original interior, original paint and even the original tires.The low serial number indicates it as one of the earliest '68s built.Possibly one of the rarest Shelby's in existence. This is a Mexican spec 1969 GT350, you'll note the non-Shelby '69 front end. Documentation shows that Eduardo Velazquez Contreras, father of the Mexican Shelby owned this car personally.This 1968 'King of the Road' GT500 was ordered from the factory with a rare special-order paint, Meadowlark Yellow (#WT6066). It is an original R-code car with 428 4V Cobra Jet engine, C6 automatic transmission and Ford 9" rear end.A beautiful example of an original GT500KR in a unique paint.Finished in Pewter Polly, with flat black accents plus orange and red stripes, topped off with special "Indy 500" decals. The new-for-1979 Foxbody Mustang was selected to Pace the annual May race, with Ford offering replicas for sale to the public.Factory Pace Car replicas included custom fog lights, rear spoiler and Recaro seats. This particular Pace Car was optioned with the 2.3L turbo 4-cylinder and 4-speed manual.Not a Mustang, but we're certainly interested in CSX2495. One of the original Shelby Roadsters built in early 1964, it came from the factory with a 289ci V8 hooked up to a 4-speed manual. Chassis number 2495 has an extensive and well documented racing history.The 289 equipped cars actually handle much better than those with the burly 427 in the nose. This one won't go cheap.