Look at this page. Anything that is operated by the computer or feeds into the computer can go, it no longer does anything.
You need the PCV. The EGR and Vapor Canister will still work and imho there is no good reason to remove them, but you can if you really want. I got rid of my decel valve because it leaked.
Don't just rip everything out. Identify and remove things one by one. There are lots of posts "I did the Nutter and ripped out all my vacuum lines, what do I do now?".
If you have a visual inspection (which at least here we have even though we don't have an emissions test for older vehicles), you may need to hide what you've actually done.