adjusting holley

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get a vaccummn gage and adjust the screws starting on the drivers side until you get the higest vac setting / then you need to run the car and read the plugs for the jetting / and reset the vac screws
black means too rich on the jets
white means too lean
tan is where you want to be!
 
i found a great video on youtube it was from a shop called t and l very infomative and easy to understand i believe it was tuning a holley if you are not so knowledgeable in this area it could help you out it was on you tube
 
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