LS-240

hey guys, just need to know what some of these fittings go to...

ls6 manifold


i don't know what #1 is for.
i'm pretty sure #2 is for the maf, which im gonna use from my old ls1 manifold. aren't those things difficult to remove? anyone have a trick that makes it easier?
and #3 just needs a hose to go to my brake booster.

ok so i just had one question regarding the rear

ok so now for the front side...
what do i do with the fitting covered in blue tape? does that pull vacuum? so i can just cap it?