* Engine Mounts: The engine mounts are likely compatible, but you might need to adjust or replace some components for a perfect fit. Aftermarket mounts are readily available if needed.
* Transmission: This is a crucial consideration. The 305 likely used a particular transmission (likely a TH700R4 or maybe a 4L60E). The 350 might use the same transmission, but you need to verify compatibility. If not, you'll need a new transmission and associated components (driveshaft, etc.).
* Exhaust: The exhaust system will almost certainly need modification or replacement. The 350 might have different exhaust manifold bolt patterns, and the pipe routing will likely be different.
* Wiring Harness and Computer: The wiring harness and computer (ECU) from the 305 might not be directly compatible with the 350. You might need to use a wiring harness from a similar year 350-equipped truck, or potentially have a custom harness made. This is often the most challenging part of the swap.
* Accessories: Power steering, alternator, and A/C compressor mounting may require adjustments or replacements.
In summary: While physically possible, swapping a 350 into a 1997 Chevy truck with a 305 is not a simple bolt-on affair. It requires mechanical aptitude and potentially some fabrication and/or purchasing of new parts. Research specific details for your truck model and the 350 you're considering to understand the full scope of the project. Consult forums and online resources dedicated to Chevy truck engine swaps for detailed information and advice.
