* Year of the 350: The 350 small-block Chevy engine was produced over many years with varying factory horsepower ratings.
* Internal components: The camshaft, pistons, cylinder heads, and other internal parts all greatly influence horsepower. A stock 350 will have significantly less horsepower than one with performance parts.
* Edelbrock carburetor model: Edelbrock makes various 4-barrel carbs with different CFM (cubic feet per minute) ratings; higher CFM generally means more potential horsepower, but only if the engine can support the airflow.
* Headers type and design: Different headers offer different flow characteristics; some are better than others.
* Ignition system: The ignition system's efficiency significantly impacts horsepower.
* Exhaust system: The entire exhaust system, beyond the headers, affects backpressure and flow.
* Air intake: The air intake system's design and efficiency influence airflow.
* Engine tuning: Proper tuning of the carburetor and ignition is critical for maximizing power.
A relatively stock 350 with those upgrades might see a horsepower increase of 20-40 hp over its original rating, but a heavily modified 350 with those upgrades as part of a larger performance build could easily produce 300+ horsepower.
To get a more accurate estimate, you'd need to provide specifics about the engine's internal components and the exact parts used (e.g., specific Edelbrock carb model and header brand and type). Even then, dyno testing would be necessary for a precise horsepower figure.
