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Got a stock 454 or close to stock Needs a carb. Would a 750 Holly with manual secondary be ok Or is it to big. Don’t want nothing to big.
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What intake you got?
A quadrajet was 800 cfm for a big block.
A custom quadrajet is comparable price wise to a Holley 750.
Both to be found here.

Personally ,I'd rather have the Qjet . Best street performance carb ever !
 

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The accelerator pump nozzle size & pump can determines how much fuel is delivered ,the accelerator pump size insures there's enough fuel for them . If your getting enough fuel with a 30cc pump , a 50cc pump won't change anything , other than buying & installing it .
 
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