* Engine Mounts: The 454 is physically larger than the 350, so you'll likely need to use engine mounts designed for a big-block Chevy in a similar chassis year. These might be aftermarket mounts.
* Transmission: The transmission compatibility depends on what transmission is currently in the truck. A 454 will likely need a stronger transmission than a 350, such as a TH400 (automatic) or a heavy-duty manual. You might need an adapter or a complete transmission swap.
* Exhaust System: You'll definitely need a new exhaust system. The 454's exhaust manifolds or headers will be different and in a different location than the 350's.
* Wiring Harness: You might need to modify or replace the wiring harness to accommodate the 454's electrical needs. This can be complex.
* Cooling System: The 454 generates more heat, so you might need a larger radiator and possibly an upgraded cooling fan to prevent overheating.
* Driveshaft: The longer and heavier 454 may require a longer driveshaft to accommodate the engine's displacement.
* Brakes: The increased power of the 454 might necessitate upgrading the brakes for better stopping power.
In short: While the swap is feasible, it's a significant undertaking requiring mechanical expertise and likely some specialized tools. It's not a weekend project. You'll need to research specific parts compatibility for your particular truck model. Consider consulting with experienced mechanics or searching online forums dedicated to classic Chevy trucks for advice and guidance.
