I think a lot of people use that as a BOV attachment point. Remove the butterfly and the linkage to it, slap on your BOV, and off you go.
Or, you could get it welded shut. You don't wanna just leave it open or anything.
If you switch t bodies the boost will blow off your tubes...put your BOV their its the easiest way and kits are available.. When I had my turbo on my C I had a BOV on my IC piping and was too lazy to weld the Bottom shut I used some banjo wire and rigged it so the linkage would keep the butterfly closed..It worked good enough..If you justy put a breather on the tb and have a bov elsewhere it wont work..like Nate said its like having a big boost leak..you wont build up enough pressure to blow off..
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