According to the Holley Illustrated Parts and Specs Manual, List number R-4548 is a service replacement carburetor for Ford 302, 390, 428, and 429 engines with Auto Trans. It is a 4160 model, meaning it uses a secondary metering plate, not a metering block; and has vacuum secondaries. The carburetor was released by Holley in 1970, and this coincides with the Ford Engineering Number.
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Don
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