Well the bottom one should definitely be fine, as its purpose it to allow more air into the manifold (under vacuum) when the air conditioning is switched on to compensate for the added load of the compressor.
The 2 above are for the power steering system and from memory that entire bottom chamber is all interlinked so they should act the same as the bottom one.
So in short, as far as I'm aware they are just standard vacuum ports.
One last thing to note though the very bottom 2 ports which point down are water ports so don't try to use them.
Tried to call you today also, I've got a tailshaft for you if still need one.