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Those ports are used to synchronise two butterfly valves to have same opening. Verify those ports go into throttle-body AFTER butterfly valves. Also measure your combined vacuum-reading at idle, should be 20-24 in•Hg (~30 kpa) at idle. If so, yes, that's good source for intake-manifold vacuum.
You can use your boost-gauge to measure intake-manifold vacuum at idle.
What is your target HP? Boost?
What size injectors will you use?
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