My father recently got what appears to be a cast iron, Mexican-made 1974 smallblock bellhousing. He wants to use it behind a 351W, but neither of us are sure if it needs a 157t flywheel or a 164 and we don't have any known bells to compare it to. Anyone familiar with this casting? Full number is D4ZD-7505-BA and it says "hecho en mexico" like a Mexican block on the transmission side.