I am coming into this late, but, if I am reading this correctly you are
complaining of poor idle quality and fast idle that won't settle down. I will
bet that in addition to all this your idle "hunts" and your tach needle goes
up
and down a little as it idles. Look for a vacuum leak. When your carb
sucks air from someplace it is not supposed to your idle suffers. As I said I
am
late into this, but if you are running Z-S carbs your bypass valves, and/or
throttle shaft bushes are the likely culprit. Open the carbs and inspect the
diaphragms for wear/tears. They must be in pristine condition for the carbs
to work properly. All of this is assuming that you have good ignition parts
in your distributor, and your dwell/gap is set properly.
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