Where can I hook up an electric choke?

So I'm trying to find a 12v source tied to the ignition switch that will provide power to my electric choke. I've tried the pink wire that supplies power to the wiper switch, but now my wipers don't work (too pissed off to mess with it more). Where can I find a good, relatively accessible (not that important) wire that I can splice into?

This is for a 1968 Plymouth Barracuda notchback.