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I'm fighting a 440 w/ a comp 268 cam and have the same prob....most people suggested messing with the dist i.e. advancing the idle timing a bunch and then limiting total advance in the dist.....I swapped carbs to one w/ holes and it didn't help me a bit...in fact my idle quality got worse.

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If there has been extensive head milling or block decking you might try shimming the rocker shafts. I got a car in a trade that the PO couldn't get to run right for nothing. I did all the same things... new carb, dist, etc. On a suggestion I used some washers as shims under the rocker shafts and it was like magic... it was just enough to allow the valves to close