Redline manifold

As you've probably guessed i know next to nothing about old engines, carbies etc etc. I'm on a pretty steep learning curb with the Escort i've got now. Trying to learn as much as possible (I like to fix things myself and not pay others if i can avoid it). As such i don't know much about carby fuel systems or manifolds.
What are the ports I have circled on this photo for? It's a Redline manifold which is as far as i can tell brand new.

What are the ports I have circled on this photo for? It's a Redline manifold which is as far as i can tell brand new.
