No, it should not be spinning. You need to tighten the set screws on each side of the BPV to secure it to the adapter flange. Then, you can bolt it on.
Look for the tiny holes on each side of the BPV, and tighten them to the flange.(--this is assuming that the set screws are there. If they are missing, you'll need to get a couple more.)
The MS6 needs to be in recirc mode, not VTA...driveability issues will arise, because the ECU is looking for the air that it thought was there, and now isn't...(because it was sent back to the atmosphere, instead of the intake.)
Hope this helps you.