Cool, according to the Mustang Recognition Guide 68s came with 289 2-barrels until the middle of the production year and were code C. The 289s were replaced by the 302 2-barrel and were code F. The 302 4-barrels were installed from the beginning of the production year and were code J. Hope this helps.
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67 428 fastback
88 GT
85 4 banger
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