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if the carburetor keeps flooding out, the float could be stuck in the up position. tap lightly on & around fuel reservoir to free. depending on age of carburetor, you might need to put in a carburetor kit.
Did you adjust the idle mixture screws ? Is this a two or four barrel carburetor and what make carb. Carter , Holley, Quadrajet etc.. What make vehicle is it ? Normally the idle mixture screws should be opened 1 and a half turns to two turns . counterclockwise from fully seated . Then you can set the idle screw to what the idle should be 600 rpm to 750 in drive . Most cars have a decal somewhere under the hood telling all these things !
Check your vacuum hoses. Holley aftermarket may not have as many vacuum ports as OEM QuadraJets, and you may have a vacuum line that isn't plugged into anything...or you may have a vacuum leak around the carb base gasket. Also, does the Holley have an electric or manual choke? Is it connected?
There are all kinds of adjustments on that vehicle. Also, it depends on which carburetor it is equipped with. That vehicle came with a Rochester 2-barrel carb, a Rochester Quadrajet carb, or a Holley 4- barrel carb. There is not enough time or space to post all of the information about this here. I would recommend going to alldatadiy.com and subscribing to the service information for your vehicle for a small annual fee, or purchacing a manual like Chilton or Haynes.
Yes, check at local auto parts store, but they may have to order it, seeing how everything is pretty well fuel injected now. Look for a tag attached, or at least some numbers, make of carb, such as holley or carter, 2 barrel or 4 barrel etc that they can use for reference.
it would be easier to buy the adapter but holley al;so makes intake manifold for this problem they are pricey but you get the full 600cfms with an adapter you wont get as much oomph out of it but and adapter is a good idea especially when you dont have 300 to blow on the manifold