Carburetor replacement - extra inlets, vacuum?

[Reese Allen]

1980 C20, small block 350 V8, had a 4-barrel Quadrajet 17080201 on it previously. I've owned it since 2012. Previous owners put a crate motor in it in 2000. No idea whether they replaced the carb.

I bought a UREMCO 3-3622 rebuilt carb to put on my truck and it's different from the old carb in a couple of ways.

First is in back, where the actuator at the rear passenger side was connected directly to a nipple nearby on the back of the carb body with a hose before, this one has a tee in the middle. I suppose I am supposed to plumb this to the nipple coming up out of the intake manifold a couple of inches away which presumably pulls a vacuum.

Second is in front, driver's side, there's an extra nipple on the new one. Old carb has nothing there at all.

I figure I should just plumb both to vacuum from the intake manifold, but figured I should ask before I go ahead with it.

Photos attached.