A C-4 will bolt up. However there are other factors. Early 289 engines have bolt pattern which uses 5 bolts, later engines have 6 bolts. I believe the change occurred during the 1966 model year. Also there are different bell housings as one model was used for 6cylinder cars and two other model for V8's
Be sure to verify the engine to housing surface to determine what bolt pattern you have prior to buying anything.
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