Some of the coolest classic American muscle cars are the “homologation specials” – street cars Ford, Chevy, and Chrysler had to build just so they could be legal for NASCAR, SCCA or NHRA drag racing.

One legend among them is the 1969 Ford Mustang Boss 429. And if you’re on the lookout for an original one, this Kar Kraft No. 2011 is hitting Mecum’s Tulsa auction on Saturday, June 7.

Ford only built the Boss 429 Mustang so they could run their monster 429 cubic-inch “Shotgun” semi-hemi V8 in NASCAR. To make it legal for the track, they had to offer a version for sale to the public in an actual car. The Boss 429 was odd in a way because Ford raced the Torino and Mercury Cyclone (and their derivatives) in ’69 in NASCAR, but for the street the Blue Oval installed the engine in a special version of the Mustang.

Ford partially assembled these special Mustangs, then shipped them to Kar Kraft, their performance contractor in Michigan, for final assembly.

Those skilled technicians then undertook the extensive modifications required to actually stuff that huge engine into the Mustang’s engine bay. Just 859 of these unique cars received this treatment in 1969, each getting a specific “KK” number.

The one heading to Mecum’s Tulsa auction, KK No. 2011, looks stunning in its factory Candy Apple Red paint with a black Comfortweave vinyl interior featuring high-back bucket seats. Mecum Auctions describes the car as being in “highly original condition.”

That giant, functional hood scoop isn’t just for show; it feeds air to the beastly Boss 429 V8 underneath. This engine came factory-equipped with an aluminum intake manifold, a small Holley 735 CFM four-barrel carburetor, tough forged steel internals, and four-bolt main caps.

The Boss 429 was somewhat under-developed for street use. The carb was actually smaller than the one used on the Boss 302 engine. It was rated at 375 horsepower; actual horsepower was around 420.

A Top Loader four-speed manual transmission with a Hurst shifter sends power to a 3.91-geared Traction-Lok rear differential. It still rides on its original 15×7-inch Magnum 500 wheels wrapped in correct F60x15 Goodyear Polyglas GT tires.

When this highly original 1969 Ford Mustang Boss 429 Fastback hits the Mecum Tulsa auction block on June 7, it’s more than just a rare car changing hands; it’s a piece of Ford’s hard-fought racing history.

That same spirit of building a no-compromise street car to dominate on the track still runs deep in Ford’s high-performance DNA today, inspiring modern monsters like the Shelby GT500. Owning a car like this KK No. 2011 means owning a part of that powerful performance heritage of Ford.