If I were in your position, I would either sell the car as a roller and go buy something else, or if you are set on putting a new motor into the car, go with a 996 based motor and enjoy the added performance. If you go the latter route, while everything is out, I'd freshen the gearbox and install an LSD.
For reference, the IMS assemblies are made by LN Engineering, and if you do go with a used motor, I would absolutely toss a new IMS bearing in the thing.
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Boxster S
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