Happened to me, but yes was with anti-lag.

If you just thread a steel plug in without tapping first, you won't really be creating any metal shavings. However, if you want to tap it first with the head on the block and in the car, best way to do it is just to pull the exhaust manifold off. That port you're blocking at the intake side feeds off the #4 exhaust port, so if you pull the exhaust manifold you can stick a piece of shop towel or something in there while you work, then a bit of compressed air to blow out any shavings before you plug it.