The Boss 429 and 429 Super Cobra Jet V8 engines rank as some of the most powerful engines ever put in the Ford Mustang. In fact, if we limit our discussion to first-gen Mustangs, these engines, both rated at 375 horsepower, would reign supreme. Ford initially approved stuffing the oversized Boss 429 V8 under the hood and between the fenders of select 1969 Mustang Fastback models, creating the Mustang Boss 429 to satisfy NASCAR homologation rules. By offering a street
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