Not Ranked
The Holleys have emulsion tubes too, inside the metering blocks and sometimes they can get some debris that will plug up one or more of the very small passages. Squirting a little carb cleaner in the air bleeds as pictured on a regular basis is the cheapest tuneup you can do.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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