The Boot Hill Express was a custom/show car. It was not meant for highway use. There were two built, the original based on an actual 1850 hearse & one was a fiberglas replica.
Specifications on the original (hearse bodied) Boot Hill Express:
450 hp, 426 cubic inch Chrysler Hemi V8 engine with Hilborn fuel injection, Chrysler A-727 TorqueFlite three-speed automatic transmission, CAE tubular straight front axle with transverse leaf spring, live rear axle with full-elliptic leaf springs, and two-wheel drum brakes. E. T. Mags 10 spoke front wheels, Cragar S/S rear with Goodyear tires. Steering is from a 1963 Volkswagen Beetle. The rear axle is from a 1948 Ford.