Does ignition timing directly affect the idle air/fuel mixture? I set the timing (by ear) on my '71 440. No starter drag, smooth idle. I then adjusted the idle circuit on the carb using a vacuum gauge. Everything seemed ok, but sometimes I can't leave well enough alone. I borrowed a timing light and set the timing to the factory specs. (My ear was way off) If I remember correctly, it was 10 deg BTDC. Now, the carb seems to be running rich. Is this somehow related to the timing? I can readjust the carb, but I would rather not start tweaking if there may be another issue.