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According to your sketch, I think it's the far left plugged hole (as looking at pic).
I don't think it matters though if both of the vacuum orifices were the same size; IE it would be applying identical vacuum.
I'm glad you are getting this fixed. The increased pressure of a turbo engine will increase the quantity of blowby and pressure inside engine. The large PCV hose going over to turbo vents a large portion.
BTW, the large hose should connect into the intake turbo hose (AMM to turbo).
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Norm Cook Vancouver BC; 1989 745T 202,000KM
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