Engineers had just ten months to design and build the new engine from scratch before ... But all of this power and performance came at a cost, as the Boss 429 was nearly $5,000 in 1970—roughly ...

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Is this the rarest Boss? An all-aluminum Can-Am 429ci. Tasca Ford owned the street with this car. Bring on Hemis and SS 396 Camaros. As one of six pre-production 1969 Ford Mustang Boss 429s ...

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With a usual cost of around $150-200k (£115-154k) for most examples, the 429 Boss will likely sit a fair amount higher, as values already hover at around that amount for unmodified versions.