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An 'S' code is for a 1967 to 1969 390 CID engine with a four barrel carburetor. A 'C' code is for a 1965 to 1968 289 CID engine with a two barell carburetor. A 'B' code was not used on Mustangs but was for a 240 CID 6 cylinder engine. You may find more in 'surfing' Ford sites.
Jim