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From Another C3 Forum:

"I have a 72 with a 350, auto, and 600 Holley that was running perfectly a few days ago and now it's idling way too fast, the headlights and wiper door won't open, and my power brakes don't work. I messed around with the idle screw but it didn't help as it still idles way too fast; like 1000 in drive and 2000 in park. Any suggestions will be appreciated".


As his headlights, wiper door, and power brakes quit working and his engine is suddenly idling way too fast at the same time I would guess he accidentally disconnected one of his two large vacuum hoses. Like the hose going to his PCV valve or his brake booster. C3's can tolerate small vacuum leaks but not large ones.
 
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