Timing help needed

I'll add one more thought on AFR. If you are setting the AFR to meet a number I have found it does not always end up being the best idle setting. I run a tight converter and I can't run anything leaner than 12.8 in neutral, engine fully warmed and maintain smooth off idle transition. In drive at idle AFR goes to 13.4 and the plugs stay clean. I use the AFR as a tool only. With a loose converter this probably would not apply. Every combo is different so give it what makes it run the best for you.