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I used an open ignition terminal on the fuse block, a relay, a power wire from the alternator, and created an IGN switched 12V fuse block. I ran the electric choke wire form it, the stereo, and I have four extra places for any other wiring needs that require an IGN source.
From: At my Bar drinking and wrenching in Lafayette Colorado
In the engine compartment, come off the wiper motor.
If you want to go through the firewall, come off any spare "IGN" (preferred) or "ACC" terminal on the fuseblock.
Whatever you do, don't use the hot wire feeding the ignition coil circuit.