1. As post #13 states you probably need to open up the idle mixture screws. I say "probably" because I don't know the angle of the points on the edelbrock mixture screws. Go around all four mixture screws a couple of times so as to achieve maximum idle or vacuum (either one) with them. Readjust idle speed to suit as you do so.
2. hook up the vacuum advance and increase initial advance slightly.
See what it does.
I would also say get rid of the edelbrocks and get a pair of real carter afbs but you've had carbs I've done and couldn't get them to work to your satisfaction either.
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