This 1964 Ford Thunderbird convertible sits at the exact hinge point between two eras of the Thunderbird nameplate — the swoopy Bullet Bird was gone, and the boxier, gadget-laden fourth generation had just arrived. It carries a 390 V8, a power-folding top, and a swing-away steering wheel most drivers today have never touched. Read on to find out what made 1964 the year the Thunderbird reinvented itself.