Upgrade your classic 1963 Chevrolet Fullsize with our premium Engine Harness designed for 283 and 327 cubic inch engines equipped with H.E.I. (High Energy Ignition) distributors. This high-quality wire harness ensures reliable electrical connections and enhances performance, making it a perfect choice for restoration enthusiasts looking for reliable ignition systems. Unlike generic alternatives, our harness is specifically modified for GM H.E.I. components, guaranteeing optimal functionality for your engine.