* Motor Mounts: While the same general location, the 350 might require different motor mounts or modification of existing ones to fit perfectly.
* Exhaust System: The exhaust manifolds or headers will likely need to be changed as the 350 is physically larger.
* Steering: Depending on the specific accessories and exhaust setup, the steering shaft might need adjustment to clear the larger engine.
* Transmission: The transmission compatibility depends on what transmission was originally in the car and what you're planning to use with the 350. You may need an adapter or a different transmission altogether.
* Wiring: The wiring harness might require some modification or replacement, particularly if the 305 had different accessories than the 350 you're installing.
* Cooling System: A larger radiator might be necessary to handle the increased heat output of the 350.
In short, it's doable, but expect some fabrication and potentially some parts sourcing. Consult a mechanic or experienced Nova owner before starting the project to ensure you have a comprehensive plan. You'll likely need a shop manual for your specific year Nova as well as a manual for the 350 engine.