Take off the vacuum line on top, block that with a screw and cable tie
Take off the bov, remove the gasket, trace thhe gasket on to a cut up coke can and cut it out.
Drill the holes where the bolts go through.
put the new coke gasket between the bov plate and original gasket, then fit the bov back on.
remove the return line, put a coke bottle cap in the return line, and use a clamp to hold it in place.
there.. all blocked off.
will it still stall?
Yes.
All I can do to help you in give you $50.
in return for your faulty factory GTR bovs..
you can then use this $50 to take it to a mechanic.
no refunds.