Lean idle. Rich cruise.

AndyF said
Pulling timing in high gear or adding timing in high gear has been a debate for many, many years. The answer is "do what the car wants".
There is some good theory behind both and it has to do with the fuel curve of the carb. Adding or pulling timing is often a crutch to fix a fuel curve issue. EFI engines might not need timing correction going down the track. And what works on the dyno might not work at the track. They dyno loading is a lot different than the load that the engine sees in the car going thru the gears. So the timing curve that picks up power on the dyno might not be the best at the track.

That's one thing I would have added as well and completely agree on. The tune on the dyno isn't always the same as down the track. A cpl more variants that need to be taken into account but are in plain sight and not always considered which I've seen many not taken into consideration. The incoming air on the dyno is usually from straight above which also has a different effect from a vehicle traveling 100++ mph . I know many race teams in the highest ranks have specific dyno carbs and specific track carbs. The tune is usually different for each situation. Yes every specific combo can have a different outcome with a tune. On the same page in most cases very specific details have also had the same outcome. Luckily for us engines are basically a repeatable mathematical equation. If they weren't we would have to start from scratch everytime we took them out At least that can give us all a generalized baseline to start with that has worked in most situations. If things need to change drastically from what works in general form the first KISS rule is make sure the basics are covered. In most cases something was missed. Last venue should be making drastic changes.