A restored 1969 Ford Mustang Boss 429 fastback in candyapple red made $260,000 at Mecum Auctions' Kansas City Spring Auction.

The muscle car is one of the highly desirable hand-built prototypes, of which only 50 were ever made.

The Mustang Boss 429 is among the most sought after muscle cars ever built

It was produced in a limited run of just over 800 to meet NASCAR's entry requirements, which stipulated that 500 cars containing the newly developed Hemi engine must be released for public sale.

This rule is known as homologation and is used as a loophole to allow specially developed vehicles to compete in races designed for modified production cars.

In 2013, a 1969 Black Boss 429 in unrestored condition sold for $417,000 at Mecum's auction in Kissimmee, Florida - a record for the model.

A 1963 Chevrolet Corvette split-window coupe made $107,000 at the April 24-26 auction.

The Corvette entered production in 1963, making this one of the earliest examples of the iconic model. In the intervening years it has been extensively renovated, with the engine rebuilt to original GM standards and the interior and exterior expertly restored.

Last year a 1963 Corvette in unrestored condition sold for $275,000 at Mecum - highlighting the value collectors place on the original components.

A Ford Mustang Restomod was another highlight, selling for $96,000. It has been extensively modified with a hot rod chassis and a 4.6L DOHC Cobra engine with a Kenne Bell supercharger.

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