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The only way you'll smooth out the idle, is to increase the RPM. Even the choppiest of race engines 'smooth out' in sound as RPM goes up, and the tamest if engines will sound like wild race motors if you dial the rpm down to 350 at idle.

Now, don't cheat and just turn your idle speed screw. Need to tune for max vacuum at idle by increasing timing. Then set dustributir to limit total timing to 36-38. If its still too choppy, get a big, single exhaust snd large muffler. Combining exhaust into 1 system helps mellow out the pulses from each other. And finally, if its still not enough, bump RPM by 150 via idle speed screw.

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