Barrett Jackson Scottsdale, 2010

[AMoore]

The 428 Cobra Jet Mustang that I saw go for over $100K was a 428 Super Cobra Jet.   The "super" is what makes it rare, although I hae seen a number of Boss 302s go for that kind of money.

 

"The 428 SCJ was first introduced during the 1969 model year. Mustang buyers who selected either of the optional 3.91:1 or 4.30:1 rear end gear ratios got more than just an optional axle ratio! Ordering either of these axle ratio options commonly triggered a few other upgrades as well, including the 428 Super Cobra Jet engine, an external oil cooler mounted in front of the radiator, and relocation of the driver's side horn to the passenger side of the radiator core support to make room for the oil cooler. Starting in February 1969 this complete package could be ordered as the "Drag Pack" option. Note that it was not thought to be possible to order an SCJ engine by itself -- the only way to get your hands on an SCJ in a Mustang was to order the optional 3.91:1 or 4.30:1 rear end gear ratios."