* Exhaust system: The manifolds and exhaust system are likely to be different, requiring replacement.
* Motor mounts: While the bolt pattern might be the same, the 350 is a larger and heavier engine, potentially requiring different motor mounts or modifications to existing ones for proper support and alignment.
* Transmission: While the transmission *might* bolt up depending on the specific transmission used in the car (and the 350), the bellhousing and associated components are highly likely to be different.
* Wiring harness: The wiring harness might need modifications, or even complete replacement, to accommodate the 350's different sensors and components.
* Cooling system: The radiator and hoses might need to be upgraded to handle the larger engine's increased heat output.
* Power steering and alternator: These components might need modification or replacement to fit the larger engine and its accessories.
In short, while a seemingly straightforward swap in theory, the differences in size, weight, and components between the 305 and 350 necessitate several modifications to ensure the engine fits properly and operates safely and reliably. It's a significant undertaking, not just a simple bolt-on replacement.
