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That is the part number for the case. Engine number is to the right of the fan. A 1973 engine # starts with 653 for carbed motor and 613 for injected or CIS.
Is the motor in the car? Trans is an issue as well. The pre-69 cars are short wheelbase (SWB) and the 69 and later are long wheelbase (LWB) so the trans and half shafts for the 66 need to match a SWB car.
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Tony G
2000 Boxster S
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