If that tranny has the BOP (Buick, Olds, Pontiac.....some people even throw a C into that,.....BOP-C.....for Cadillac) bolt pattern, the 425, 472 and the 500 will all bolt up. The real question is......Will the tranny stand up to the torque of these motors? That question I can't answer. I don't know anything about the TH325.
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