* Factory Options: The most common were the 5.0L (305 cubic inch) small-block V8 and the 5.7L (350 cubic inch) small-block V8. These are the easiest swaps because all the mounts, wiring harnesses and other components are designed to work with them.
* Possible Swaps (with varying levels of difficulty): Many other small-block Chevrolet V8s (like the 383 stroker) and some big-block Chevrolet V8s are physically possible to fit, but require significant modification. This would include fabrication of new motor mounts, potential exhaust modifications, and likely changes to the wiring harness and computer system. You'll also need to consider the transmission compatibility.
* Things to Consider for Swaps: You'll need to deal with:
* Motor Mounts: New mounts will almost certainly be required for any engine other than the factory options.
* Transmission: The transmission needs to match the engine. You might need a new transmission, driveshaft, and potentially other drivetrain components.
* Wiring Harness: You might need to modify or replace the wiring harness to accommodate a different engine's computer and sensors.
* Exhaust System: The exhaust system will likely need modification or replacement.
* Cooling System: The cooling system may need upgrading to handle a more powerful engine.
* Computer Control: Engine management systems (ECM/PCM) will need to be addressed and likely reprogrammed or replaced.
* Body Clearance: Larger engines might require body modifications for clearance.
In short: While a direct swap with a 305 or 350 is relatively simple, anything else requires significant mechanical knowledge, fabrication skills, and potentially considerable expense. You'd want to consult resources specific to Chevrolet Caprice engine swaps for detailed instructions and compatibility information. Forums and online communities dedicated to these vehicles are excellent resources.
