* Bolt Pattern: The bolt pattern is the same.
* Intake Manifold: You'll need an intake manifold designed for the 305 head's bolt pattern. While the pattern is the same, the port size and shape might be different, affecting performance if you reuse a manifold designed for the 350's original heads.
* Performance: 305 heads generally have smaller combustion chambers and smaller valves than 350 heads. This can lead to a lower compression ratio and potentially less power, especially at higher RPMs. Using 305 heads on a 350 might be fine for a low-power application, but it's not ideal for high-performance builds.
In short, it will physically fit, but the performance might be suboptimal. If you're aiming for better performance, using heads designed specifically for the 350 is recommended.
