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Looks like the throttle plate gasket is weeping. Pull the carb and tighten the phillips head screws on the bottom of the carb. Spray down the carb body with carb cleaner to clean off the dirt and fuel.
Re-install, ,do the float adjustment.
Fire it up and watch the base for seepage. if it seeps, you'll have to replace that base gasket.
Might want to buy a Holley rebuild kit so you have all the gaskets handy