* Engine Type: While both likely use a Ford V8, the exact engine (e.g., 4.6L, 5.0L) and its internal components might differ. You'd need to verify the exact engine codes from both vehicles.
* Wiring Harness: The engine harness and computer (ECU) are specific to the year and engine. You'd likely need to adapt or replace the harness to make it work.
* Mounts: While the general engine bay layout is similar, the engine mounts themselves may have subtle differences.
* Exhaust System: Exhaust systems are generally year-specific.
* Accessories: The power steering pump, alternator, and other accessories might not bolt directly onto the later model car.
* Transmission: Ensure the transmission is compatible. While a similar automatic transmission might work, there could be subtle differences that cause problems.
In short: It's not a simple bolt-in. You'd need significant mechanical knowledge and likely need to fabricate parts or modify the existing ones. It's a much larger project than just swapping engines and would involve considerable time and effort. It's far easier and more cost-effective to find a used engine of the correct year and type for the 1997 Crown Victoria.