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For adjusting carbs it's usually best to advance your timing a lot. Set it at about 20 BTDC for adjustment. Do what KK says but if adjusting the idle screws doesn't seem to make much difference (if you don't notice the idle increasing or decreasing as you adjust), your power valve may be set to low. In that case, hook up a vacuum gauge and see how much vacuum you're getting. Your carb probably has a 6.5 inch power valve. You should install a power valve about 1-2 inches lower than your measured vacuum at idle. FYI, I had to install a 5 inch power valve in my carb and I found that my 428 likes a ton of initial advance. 24 degrees initial and about 40 degrees total.
Chris
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