For a 750 horsepower (HP) small block Chevy engine using a Holley carburetor on a 440 cubic inch Dodge, you would typically start with jet sizes around 72-78 for the primary side and 76-84 for the secondary side, depending on specific tuning needs and fuel type. However, it's essential to fine-tune the jet sizes based on air-fuel ratio readings and performance testing, as engine setups can vary significantly. Always consider factors like elevation, temperature, and intended use when determining the final jet sizes.
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