[eagle]

There are too many variables to say definitively where you need the lever position. Every car will vary, and quite a lot too. Advance the spark until you just start to hear pinging at full acceleration, then retard it just enough to make it go away. If you can't hear good enough to detect pinging, teach a kid what pinging sounds like and have him/her ride with you for a while and have them listen. If you don't know what ping sounds like, go on YouTube and educate yourself.