* Engine Size and Weight: The 3000GT's engine (typically a V6) is significantly larger and heavier than the Shadow's four-cylinder engine. This would require major modifications to the engine bay, including potentially cutting and welding the firewall and possibly even modifying the subframe.
* Mounting Points: The engine mounts are completely different. You would need to fabricate custom engine mounts.
* Transmission: The 3000GT's transmission won't bolt directly to the Shadow's transmission bellhousing. You'd likely need a custom adapter or a complete transmission swap as well.
* Wiring Harness and Computer: The 3000GT's engine control unit (ECU) and wiring harness are completely different. Integrating this into the Shadow's system would be an extremely complex task, requiring extensive rewiring and potentially a standalone ECU.
* Drivetrain: The drive axles, differential, and other drivetrain components are incompatible. Significant modifications or complete replacements would be necessary.
* Cooling System: The cooling system of the 3000GT is designed for a much more powerful engine and would likely require modifications to fit into the Shadow.
In short, while enthusiasts tackle far more challenging swaps, this one would be an extremely time-consuming, expensive, and complex project requiring extensive fabrication skills, welding experience, electrical expertise, and a deep understanding of automotive mechanics. It's far beyond a simple engine swap.
