Some very useful DCOE tuning data (and plots) on this page:

http://www.japanesenostalgiccar.com/forum/viewtopic.php?f=1&t=1600&start=960

and post #14 here:http://www.alfabb.com/bb/forums/carburetors-fuel-injection/151191-dcoe-fast-idle-problems.html

Photo of correct fuel level in the main jet well of a DCOE 40 151 carb.

You can see the faint fuel level ~ 25mm down from the top of the well.

You can also see the exit port to the main venturi nozzle 23mm down.

Well I will echo what the poster found in that thread on JNC. I upped to 32mm chokes and I found out I had lost some of that instantaneous throttle response. Car also has a slight stumble with the current jet setup I am running as well. I have a lean spot that I think I can tune out with proper accelerator pump settings. But I have not messed with those at all up to this point. I will need to do some research. But it is a fact that when you change the chokes to a larger size, the velocity through that throat section is slower and will make lower rpm operation a bit more fickle.

I have not looked at my AFR gage in two weeks now, as I am just having fun driving her, but I may make one last swipe through the jets and see what I can come up with to address that lean spot in 4th gear when I transition to the mains from low rpm to high rpm at part throttle.