It would be difficult to say exactly which of the classic muscle cars is today the most valuable, but Ford
’s Boss 429 Mustang is likely to be it, thanks largely to its rarity. The Boss 429 was built only for NASCAR homologation purposes, as a way to compete with Chrysler
’s legendary 426 HEMI, and a mere 859 units were therefore created. These cars actually started as 428 Cobra Super Jet Mach 1 units, and were extensively modified by Kar Kraft to make the new engines fit.