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Looks to be the knock sensor, which bolts underneath the intake manifold, against the block.
There are two vacuum inserts/nipples on the top of the throttle body. The larger of the two on top goes to the bov directly. The smaller one on top will T into the fuel pressure regulator, and then branches to boost gauge (if you have one). The vacuum insert/nipple on the bottom of the throttle body goes to your charcoal canister. (I'm not running canister on mine, so I have my bottom one going to wastegate)
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