First Gen Unsteady Idle

It seems my idle is not as steady as it should be. Synced the carbs, set the tps, and even ran seafoam thinking the pilot jets could be clogged. Tach needle seems to hold steady and then maybe fall by 100 rpms then goes back up but this is not a constant cycle. I have a two brothers slip on with a holeshot stage 1 and timing advancer installed. Any help would be appreciated.
 
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