Ask any knowledgeable blue oval enthusiast to name the quickest pure-production Mustang of the muscle car era, and most will say the 1968 Cobra Jet. It was packing a power plant based on the staid 428-cid big-car engine, but had larger valve heads and the race-brewed 427’s intake manifold. It also had ram-air induction and a hood scoop that funneled air directly into a 735-cfm four-barrel carburetor. Output was an easy 410hp, but the factory rated it at 335hp in an effort to calm insurance agents and con drag strip rules-makers.