* Size and Weight: A 544 is considerably larger and heavier than a 400. This will impact the car's weight distribution, potentially requiring suspension upgrades to handle the extra weight and maintain proper handling.
* Engine Mounts: The 544 will require custom engine mounts to fit properly into the Firebird's engine bay. The existing mounts will almost certainly not work.
* Exhaust System: A completely new exhaust system will be needed, likely custom-made to fit the larger engine.
* Transmission: The existing transmission might not be able to handle the significantly increased torque of the 544. An upgrade to a stronger transmission (and possibly a custom driveshaft) will likely be necessary.
* Cooling System: The 544's increased displacement requires a more robust cooling system. Radiator, hoses, and possibly the water pump will need to be upgraded or replaced.
* Wiring Harness: While some components might be compatible, modifications to the wiring harness will likely be necessary.
* Firewall and Body: You may need to clear more space in the engine bay, potentially requiring modifications to the firewall or other bodywork to accommodate the larger engine.
* Structural Integrity: The extra weight and power might stress the car's chassis and frame, potentially requiring reinforcements.
In short, swapping in a 544 is a major undertaking, far beyond a simple engine swap. It requires significant mechanical expertise, fabrication skills, and a substantial budget. It's a project for experienced mechanics and hot-rodders, not a beginner's project.
