* Engine Management System: The 2012 engine uses a far more advanced and sophisticated engine control unit (ECU) and associated wiring harness. The 1999 Camaro's system is completely incompatible. You'd need a stand-alone engine management system, a huge undertaking.
* Mounting Points: The engine block and ancillary components (alternator, power steering pump, etc.) will likely have different mounting points and bolt patterns. This would necessitate custom engine mounts and potentially significant fabrication work.
* Transmission: The transmissions are not interchangeable. Even if you could adapt the engine, you'd also need a compatible transmission from a 2012 Camaro and adapt that as well.
* Wiring Harness: The 2012 engine harness is designed for a completely different car, meaning extensive rewiring would be required to connect it to the 1999 Camaro's systems.
* Exhaust System: The exhaust system would need complete fabrication to fit the new engine.
In short, while technically *possible* with immense effort, time, and money, it's not a practical swap. The cost of the engine, the labor involved, and the parts required would likely exceed the value of the resulting car by a significant margin. Consider a more compatible engine swap for your 1999 Camaro if you're looking for an upgrade.
