* Motor Mounts: The 350 is physically larger than the 305. You'll likely need motor mounts designed for a 350 in a second-gen Firebird (or custom mounts).
* Exhaust: The exhaust manifolds or headers will need to be changed to fit the larger engine.
* Transmission: While the transmission *might* bolt up (depending on the transmission in your 305 Firebird), you may need to adapt the transmission mounts or even consider a different transmission entirely for optimal performance with the 350.
* Wiring Harness: You'll likely need to modify or replace the wiring harness to accommodate the 350's different sensors and components. A custom harness is often the easiest solution.
* Cooling System: The 350 produces more heat. You might need a larger radiator and potentially an upgraded cooling fan to keep the engine at a safe operating temperature.
* Steering: Depending on the accessories used on the 350, you might have clearance issues with the steering components.
In short, while it's *doable*, it's not a simple swap. It's a significant project requiring mechanical aptitude, tools, and likely some fabrication skills. You'll need to research specifics related to your particular 305 and the 350 you intend to use. Many forums and websites dedicated to Firebirds and engine swaps can provide invaluable information and guidance.
