Vacuum question

On a 75 vette what else besides the headlights are controlled by the vacuum system. Im gonna swap out to the non pop up headlights and was wondering what the hell else runs on that system.

Your power brake booster, the heating/ac contols, the distributor advance.

AAhhhh I knew there was more I just couldnt think of what. Thanx much

Take a look at this link...http://vetteworks.tripod.com/techdocuments/Vaccum.html