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Also the reason I thought the motor isn't correct is it's holes don't line up with the base, maybe it's missing an adapter plate or something ?
Hello Lorenz and Mowerfreak
I wish I knew the answer to that ...

There is evidence of a plate to mount the engine ...
It appears that it was designed to keep correct belt angles.
I have never seen a Whirlwind with a RH PTO.
Any ideas welcome.

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Hope this helps.
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Jack