When choosing an aluminum intake manifold for a 305 Chevy engine, consider factors like performance, compatibility, and intended use (street, strip, or both). Here are some top recommendations:  

Edelbrock Performer EPS Intake Manifold (PN 2701)

Best for: Street and mild performance.
RPM Range: Idle to 5,500 RPM.
Features: Dual-plane design improves throttle response and low-end torque.
Benefits: Great for daily drivers and mild performance upgrades. Optimized for the 305’s smaller displacement.  

Edelbrock Performer RPM Intake Manifold (PN 7101)

Best for: Higher performance street or mild race applications.
RPM Range: 1,500 to 6,500 RPM.
Features: Dual-plane design with a larger plenum and runners.
Benefits: Balances low-end torque and upper RPM power, ideal for more aggressive builds.

Weiand Street Warrior Intake Manifold (PN 8120)

Best for: Stock to mild performance upgrades.
RPM Range: Idle to 5,500 RPM.
Features: Dual-plane design for excellent low-end and mid-range power.
Benefits: A great choice for stock or slightly modified 305 engines, focusing on street performance.  

Professional Products CrossWind Intake Manifold

Best for: Street performance with moderate modifications.
RPM Range: Idle to 6,200 RPM.
Features: Dual-plane, air-gap design improves cooling and increases airflow.
Benefits: Designed for improved throttle response and fuel atomization.

Holley Street Dominator Intake Manifold

Best for: Mild to moderate performance.
RPM Range: Idle to 6,500 RPM.
Features: Single-plane design, better suited for modified engines.
Benefits: Offers more top-end power, ideal for slightly more aggressive setups.  

Key Considerations

RPM Range: Choose a manifold that matches your camshaft and intended engine use.
Carburetor Compatibility: Ensure the manifold matches the carburetor you plan to use.
Port Size: Check if the manifold port size matches or can be easily matched to your cylinder heads.
For a mostly stock or mildly upgraded 305, the Edelbrock Performer EPS (PN 2701) is often the best choice due to its balance of performance and streetability.