What kind of crazy person pulls the super-rare 429 Cobra Jet big-block out of a 1971 Mustang convertible, and installs a Boss 429? “I’m not sure because I was not that person,” Kirt Fryer says.

Don't let the "351" decal on the hood fool you; this 1971 Ford Mustang Mach 1 packs more punch than a 429 Cobra Jet model.

Yeah, after 1971, performance muscle started going ... In fact, the performance of the Boss 351 was only a tick under the previous Boss 429 Mustang! Sure, the 1969 BOSS 302 (which duked it out ...

The restyled Mustang of 1971 was getting closer in body size ... The Boss 351 was a street car – unlike the Boss 302 and the 429, it played no part in homologating the engine for either Trans ...

A rare Mustang has been found in a barn after ... The Boss 351 was only available for the year 1971 and was slotted under the Boss 429. As the name suggests, it features a 351 cubic inch V8 ...

How could a 351ci V-8 of 1971 grab bragging rights over the likes ... "I have a Boss 302 Cougar Eliminator with a 4.30 Detroit Locker and a Boss 429 Mustang. The 351 rounds out the Boss group." ...

A rare 1970 muscle car just stunned auction watchers by selling far above value, despite never turning a single competitive ...

In order to fit the big motor into the Mustang's engine compartment, each Boss 429 had to be hand ... 1969 and 1970. When, in 1971, NASCAR banned the 429 and other engines in its class, Ford ...

Looking to build off the huge success of the original Mustang, Ford looked to drum up interest in the pony car by making huge changes for 1971 ... to the powerful 429 Cobra Jet.

But the Boss ... Mustang standards. Luckily, there's one for sale on eBay. Welcome to You Must Buy, our daily look at the cars you really should be buying instead of that boring commuter sedan ...