Get familiar with this site or a similar one, the diagrams will help out.
As mentioned above, I believe some of those components are HF specific. This diagram (under "control box tubing") shows those components present when an HF model is selected. You can still hook up the Purge Solenoid that's already on the manifold to any free vacuum port (the last pic you posted in your initial post of this thread, there should be a port right next to it). I'd suspect you can remove that whole assembly off the firewall at this point, according to that pic, it is holding a purge solenoid which is mounted to the manifold on newer models, a map sensor which is mounted on the throttle body on newer models, and a control valve and a frequency valve which I can only imagine both being unique to the HF engine which you no longer have.
I can only think of one reason to leave it on there really, and that is to avoid having to extend the connector for the purge solenoid that is mounted on the intake manifold. Much easier to find a length of vacuum line to reach a port on the intake manifold than it is to extend that electrical connector going to manifold mounted purge solenoid. Your call.