The 1963 Ford Galaxie 500XL offered buyers a spread of engines topped by an all-new 427-cubic-inch V8, built specifically to exploit NASCAR’s newly raised displacement limit. The rarest version, a dual-carburetor 425-horsepower R-code, saw fewer than 3,900 examples built for the entire model year. That combination of race-bred engineering and genuine scarcity makes surviving R-code Galaxies among the most valuable full-size Fords ever built.