your bov should be ok there!
The reason you car would have run like crap is cause of an air leak. -- sucking in more air and not having enough fuel or it was riching up to try and compensate.
As for the vac line you are using . Try and find out where it goes. Some lines will be ok to T from others wont.
Do you have any spare / unused vac ports on you inlet manifold ???
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