Thread: Holley Carb

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check the top for clean bleeds--sometimes they get junked up, use a tiny drill bit to just twist to scrape the hole clean and then squirt carb or brake clean down them---might even help to back out or remove the idle mix screws so more fluid can pass then reset
1 1/4to 1 3/4 open

The best way to do an older carb over is to take it totally apart. Use either brake clean or lacquer thinner with a stiff small brush and small diameter wire to run thru the air bleeds. I don't like using small drills in air bleeds as you can remove metal from the hole and change the flow.
Then using high air pressure and blowing everything out and put back together with all new gaskets.