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All the small block Fords were 28oz until 1981. The 302 changed to 50 oz. All 351's are 28oz. You may also want to check and make sure that a 164 tooth flywheel will work with your bellhousing. Almost all cars used the 157 tooth (Mustang GT) flywheel. The aluminum bellhousings will only accept the 157.
Don
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