The heart of the kit car concept is a narrowed rear frame section. Shown here is the Arrow Dynamics version for popular late-model Detroit "unibody" cars, designed for use with stock front suspension.

To Steve and Monica Behnen, there's nothing quite like the L/thrill of a Rat-motored Pro Streeter engaged in straight-line acceleration. This highly modified '75 Vega is their latest—and most powerful ...