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There you have two screws that you can take out to use. I took one off to feed my turbo. You can use it for your oil cooler.
Why do you want so badly to install one?
I only run a wastegate and FIC. At 6psi, the wastegate relieves pressure to keep it that as a max. Don´t buy a less than 44mm wastegate as our engines move big amounts of air.
There you may want to buy a good one. Tial or PTE (Precision) will work. I have a PTE 46mm wastegate with springs from...
Yes, you should put a PCV valve just there, because if not, you´ll be boosting your cams.
I disconnected completely both vents from the manifold, less things may fail that way.
If you follow that image, you should put a PCV to close when boost and release at vacuum.
Nice! Those Walbro pumps were the only thing that wasn´t a 100% quality product on your car.
Denso performs better and are far more reliable than walbro´s.
Remember that these pumps have two speeds on the Supra TT´s, maybe that high current at start made that difference.