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The 1970 Ford Mustang Boss 429 Fastback stands as a titan among American muscle cars, a rare and highly coveted machine born from Ford’s ambition to dominate NASCAR. To compete with the formidable Chrysler Hemi engines, Ford developed the potent Boss 429 engine, a powerhouse that necessitated significant modifications to the standard Mustang platform. This particular Boss 429, scheduled to cross the block on Friday, May 16th, at Indy 2025, represents an extraordinary opportunity to acquire a piece of automotive history, especially given its ultra-rare color combination and meticulous restoration.
Unveiling the Legend: The genesis of the Boss 429 lies in Ford’s pursuit of NASCAR glory. The engine, featuring aluminum cylinder heads with a unique “crescent” combustion chamber, a single 735 CFM Holley 4-barrel carburetor, and an aluminum intake manifold, was a force to be reckoned with. While officially rated at 375 horsepower, its actual output was widely believed to surpass 500 HP. Due to its sheer size, the massive Boss 429 engine required extensive modifications to the Mustang chassis, a task entrusted to Kar Kraft in Michigan. They widened the shock towers, extended the inner fenders, and relocated the front suspension mounts, bestowing these special Mustangs with unique “KK” identification numbers.
A Rarity in Calypso Coral: This specific Boss 429, built on November 4, 1969, and originally delivered to B & R Wilson Inc. in North Carolina, is an exceptional find. It is one of only 13 ever produced in the striking Calypso Coral exterior finish paired with a white knitted-vinyl bucket seat interior. Astonishingly, only five such examples are known to exist today, making it the most sought-after color combination among Boss 429 enthusiasts.
Power and Performance: Under the hood resides the matching-numbers 429 CI V-8 engine, a true testament to raw American power. This legendary engine is mated to its matching-numbers RUG 4-speed close-ratio manual transmission, complete with the iconic Hurst Competition Shifter. Further enhancing its performance pedigree is the factory-equipped Code V 3.91-ratio rear axle with a Traction-Lok limited-slip differential, ensuring optimal power delivery to the rear wheels.
Exquisite Restoration: This exceptional Boss 429 has undergone a no-expense-spared, nut-and-bolt rotisserie restoration performed by a renowned marque expert. The engine bay is meticulously detailed with correct production chalk marks, tags, and decals, reflecting an unwavering commitment to authenticity. The undercarriage has also been restored to the highest standards, showcasing the meticulous attention to detail that defines this remarkable restoration.
Stunning Aesthetics: The rare factory Calypso Coral paintwork is described as absolute perfection, boasting exceptional depth and a mirror-like finish achieved through wet sanding and polishing. The exterior retains its understated yet aggressive styling, featuring white Boss 429 decals on the front fenders and gleaming chrome Magnum 500 wheels wrapped in Goodyear Polyglas tires. Inside, the ultra-rare and highly desirable factory white knit-vinyl high-back bucket seats create a striking contrast with the vibrant exterior.
Loaded with Options: The accompanying Marti Report confirms a host of desirable factory options, including the Drag Pack, Competition Suspension, Convenience Group, electric clock, F60x15 tires, collapsible spare tire, rim-blow deluxe steering wheel, console, power front disc brakes, power steering, AM radio, Décor Group, deluxe seat belts, tachometer, functional front air spoiler, and a trunk-mounted battery.
A Collector’s Dream: With its top-tier restoration, incredibly rare color combination, matching-numbers drivetrain, and comprehensive documentation, this 1970 Ford Mustang Boss 429 represents a once-in-a-lifetime opportunity for discerning collectors. Estimated to fetch between $575,000 and $625,000, this Calypso Coral masterpiece is not just a car; it’s a true icon of American muscle.
Summary:
- 1970 Ford Mustang Boss 429 Fastback.
- One of only five known in Calypso Coral with a white interior.
- Matching numbers 429 CI V-8 engine.
- Matching numbers 4-speed manual transmission.
- No-expense-spared rotisserie restoration.
- Documented with Marti Report and Ford invoice.
- Estimated value: $575,000 – $625,000.
Disclaimer: Information provided is for general informational purposes only and is based on available details. Potential buyers are advised to conduct their own thorough inspection and verification of any vehicle.
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