Here's why it's difficult:
* Size and Weight: The 3800 supercharged engine is larger and heavier than the Aztek's stock engine. This would require significant modifications to accommodate the physical dimensions, especially with regards to the supercharger's placement.
* Mounts and Accessories: The engine mounts would need to be custom fabricated. The placement and routing of the power steering, alternator, AC compressor, and other accessories would present major challenges. They might not physically clear existing Aztek components.
* Exhaust System: A new exhaust system would be necessary, and routing it within the Aztek's chassis might be complicated.
* Transmission and Drivetrain: The transmission compatibility is a big hurdle. The 3800 supercharged engine usually came paired with specific transmissions that may not directly bolt to the Aztek's existing drivetrain. Adapters or custom driveshafts would likely be needed.
* Wiring Harness and Computer: Integrating the 3800's engine computer and wiring harness with the Aztek's electrical system would require extensive electrical work and potentially custom programming.
In short, while technically *possible* with a lot of fabrication and engineering expertise, it's a hugely complex project far beyond a simple swap. It's more realistic to consider a different engine swap, or even modifications to the Aztek's existing engine for increased performance, as simpler alternatives.
