First days with an AEM AFR guage installed, Hmmmm.... rich at cruise? Options

[Gint]

Running pretty good. It could be leaner, but it's not horrible for a pair of carbs that sat for well over a year and a half without a rebuild. I'm getting anywhere between 12 and 13.7 to 1 when I'm getting on it. Goes a lean for a second during transition from idle to mains. I'll work that out eventually. About what I expected. Not perfect, but that was the point of installing the gauge and getting a baseline before I touched anything. The gauge does tend to fluctuate quite a bit. Even at steady state throttle/speed/grade/etc...

What's weird to my mind is that it goes stupid rich at cruise. I expected it to lean out some. Trailing throttle cruise sometimes goes as low as 10.5 briefly, usually around 11:1 though. It will go up sometimes as high as 12 at slight throttle cruise, but I expected that to be leaner as well.

Thoughts?

2.0 with about 10K on a local rebuild, 10 years ago. It's the 4 from Scott's Martini car. Stock build, pistons, cam, everything stock based on the receipt from the build. Dual Weber 40IDF's that sat for almost two years before this engine fired again this last time. I haven't rebuilt them yet. I have new jets and 32mm vents from ACE. I want to baseline what I have now, rebuild, adjust, baseline and then re-jet and check it out again. I want to see the effects of the changes as I do them.

Carbs now:
60 idles
115 mains
F11
2.0 AC
28mm Vent

[stugray]

Here is an interesting way to view data:

http://datazap.me/u/stugray/914?log=0&...;zoom=1716-4499

That should show my AFR for a ~10 minute drive around.
Sometimes you have to click and drag on the graph to get it to regenerate & show the lines
If you click on the EGTs you can see them too, but then it autoscales so you cant makeout the AFRs.

They seemed to be in the 11-13 range most of the time.

I'll get my carb parameters tomorrow.
They are dual 40 IDFs on a 2056 with a webcam 86b & ~9.5:1 CR.