Time for a little history lesson. Don’t worry, the test will be open book. Back in the ’60s, retired racer Carroll Shelby added enough spice to the then-new Mustang to turn it from hot to hotter. Today a legit one is a six-figure proposition–or more, as a one-of-one, GT40-powered Shelby GT500 Super Snake just sold for $2.2 million.
Now let’s …