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Hysteric, that is an excellent post. Thank you for the link. I am looking at the chart now and I agree that my 440 is far happier with an idle between 11.7-12.6. I get far better vacuum readings with that A/F

My problem is when RPMs increase off-idle, the mixture drops in A/F to 10-11 and I get a stumble in power. After the quick stumble it starts to lean out as it should. I only get this from idle. If I lean the idle mixture to 13-14 then the drop and stumble is not as bad.

On the other end, the power is 1-2 points too lean even with the jet and rod changes and my WOT is still too lean as well. I am hoping some spring changes today may help with those too.

As for the low-end rich stumble, I may replace the nozzle on the accelerator to get a leaner injection to help me get that smooth transition from idle to cruise that is shown in the chart you posted.

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All Classic Symptoms Of The 1407/1411 That You Are Experiencing

With that said , I will keep my negative comments to myself , and the one thousand other negative threads that I could post about the 1407/1411

Good Luck , At Least Your Making Progress

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I find it quite comical that you seem to show up on every Edelbrock carb post. Never any helpful tips or information, just that they're terrible. Why do you bother?
Doug

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Its not my problem that 90% of the Edelbrock posts on this website are directed at the 1407/1411 Series Carbs

And I only state that the 1407/1411s are terrible , so lets clear that up right away

Anyways , to answer your question

To save people alot of headaches , alot of wasted time spent working on something that cant bee fixed without drilling this that and , alot of money also - But I guess guys like you cant read very well - Click on the link that Hysteric posted , some pretty valuable info in there - I could post some more links if you like ??? Chances are you wouldn't read those either ,or just read what you want or might understand - There was a thread a few weeks ago - Even an Edelbrock Tech basically said the very same thing in that thread , Don't you find that kind of comical , An Edelbrock Tech would say such a thing ???

Helpful , its called - EDELBROCK 800 1412/1413 Series or EDELBROCK 650/800 AVS Series !!!

You can thank me later