11. Shelby GT 500
Mustang had some performance versions like the GT with the 289 HiPo V8 engine or the Shelby GT 350 in 1965. However, the first true performance Mustang with a big block engine and respectable 0 to 60 mph times was the 1967 Shelby GT 500. Bigger and more powerful than before, the 1967 GT 500 featured a new design with a modified front and rear end. It also had a big 427 V8 engine with 335 HP and 420 lb-ft of torque.
In those days, Ford was notorious for underrating the power output of their engines, so the 335 HP rating sounded too low for a big 427. Car enthusiasts claim the real power was closer to the 400 HP range and performance figures backed that claim. The 0 to 60 mph time was 6.5 seconds, which was good for the day. Thanks to suspension modifications, the GT 500 could handle the curves well, too.
The Shelby GT 500 was one of the first models to receive collector car status. This affected the prices, which are not that high, but still lofty at around $160,000 for good examples.