One of the first 50 hand-built Ford Mustang Boss 429 Fastback prototypes complete with an early 820-S Nascar engine is heading to Mecum's Kansas City auction next month, having been rotisserie restored in 2009. The first 15 prototypes were designated as test cars and as the 38th Boss 429 to be built, this superb example is the 23rd car offered to the public.

It comes with a complete ownership history, and original build sheet, while Boss expert Ed Meyer applied the final detailed markings after Muscle Car Restorations restored the car a few years back. As the first Boss 429 to feature the iconic Candy Apple red paint work, Mecum should have no trouble finding a buyer for it at the Kansas City Spring auction that runs from April 24-26.