Why do you have a mixture screw on an electronic carb? The ecu is supposed to control it, that ain't right.
Anyway it looks like it's meant to be a standard ecc set-up, for which i have a link to an online manual that shows each and every component, and shows you exactly where all the vaccum pipes go.
http://www.supermotors.net/registry/7742/23795-2
Every page of the manual is a picture and there are quite a lot so it'll take a min or two to load, then you can do the old "save picture as" trick to keep the pages you want for future reference.
The big old black pipe that has broken off of the rocker-cover (cam-cover) is part of the Positive Crank Ventilation system which is responsable for maintaining the correct internal pressure of the engine block.
You will need to either get it welded back onto the rocker cover or replace the rocker cover with another one.
The wiring looks to have been tampered with and the clear pipe with the screw in it, is meant to be connected to the airbox.
Check out the manual on that link and you'll have all the info and diagrams to have that thing set up straight in no time (Y)