Which 1990 throttle body port for lower BOV nipple?

[90 GSX]

I just did the dodge garage mod to my stock bov and it works perfectly, except at low boost if I don't take my foot off the gas quickly the valve flutters which is making the compressor wheel surge. Right now my MBC is tapped into the bov line and I want to tap it into my IC pipes. I would rather tap only one nipple into my j-pipe and use that solely for my mbc, and then use one of the tb ports that is seeing IC pipe pressure (not manifold pressure), so I can keep my mbc, bov, and lower bov on dedicated reference sources.

Main question: Which port can I use on a 1990 throttle body that references IC pipe pressure, not manifold pressure?

 

[90 GSX]

Just so you know it's the top nipple of the two that are on the right side of the throttle body. You can see the passage clearly with the TB off.