Lean idle. Rich cruise.

Well since this topic has wandered all over the place, for those interested in a deep dive with Shrinker, and Klaus came across this one while looking for a different thread. It does touch on timing for a race car. Also Klaus's explanation for rich - lean changes between gears better answers a question I've had.
https://www.tapatalk.com/groups/britishqueen/viewtopic.php?f=2&t=347&p=414
Here's an archived thread where Mark W suggests a slow short advance and Bill Jones mentions idle-eze :)
https://www.tapatalk.com/groups/britishqueen/viewtopic.php?f=2&t=135&p=162