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HolleyThe Holley was first used on a Chrysler vehicle with the '64 Race Hemi cross-ram package, but made its true street debut on '67 440 low-compression engines. It became more prevalent in 1970 on 383 engines and began to phase out in 1972 after a run on the entire 440 line. All Chrysler Holleys are 4160 models with vacuum-secondary operation. The part numbers on Holley carbs begin with R, and both that and the date code can be found on the forward-facing side of the choke air horn.