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http://auto.howstuffworks.com/define-1964-ford-thunderbolt.htm

Extensive front-end modifications were necessary to custom-fit the big-block, and eight equal-length exhaust headers had to be snaked through the suspension components. The competition 427's high-rise manifold elevated the air cleaner above the fender line, requiring a teardrop-shaped hood bubble. It gulped air via screened inner headlight bezels. Transmissions were a Hurst-shifted four-speed with 4.44:1 gears or an automatic with 4.58:1. Massive traction bars, asymmetrical rear springs, and a trunk-mounted 95-pound bus battery helped get down what was realistically 500 bhp.

Weightcutting was merciless: plexiglass windows and fiberglass front body panels, bumpers, and doors. Sunvisors, mirror, sound-deadener, armrests -- even jack and lug wrench -- were shed.

The back seat stayed, but the fronts were lightweight Econoline truck buckets. At 3225 pounds, the T-bolt weighed more than a stock Fairlane. But it was only 20 pounds over its NHRA-class minimum. At last, Ford had a winner. ETs in the 11s earned Thunderbolt the Top Stock crown and Ford the '64 NHRA Manufacturer's Cup.