Here's why:
* Engine mounts: The 3.3L and 3.8L engines have different mounting points on the engine block. The 3.3L engine mounts will not align with the 3.8L engine mounts on the 1994 Skylark.
* Engine wiring harness: The wiring harnesses for the 3.3L and 3.8L engines are different. You would need to swap the wiring harness as well as reprogram the engine control module (ECM) to match the 3.3L engine.
* Exhaust system: The exhaust systems for the 3.3L and 3.8L engines are different. You would need to modify or replace the exhaust system to accommodate the 3.3L engine.
* Transmission: The 3.3L and 3.8L engines may have different transmission bell housings, which means the transmission may not be compatible with the 3.3L engine.
In short: While it is technically possible to swap the engines, it would be a very complex and time-consuming process. It is not a simple swap, and it is not recommended.
Recommendation: If you're looking for a more powerful engine for your 1994 Skylark, consider finding a used 3.8L engine that is in good condition. You may need to replace the engine mounts and wiring harness, but the swap will be much simpler than using a 3.3L engine.
