Engines that *could* theoretically be fitted, but would require extensive fabrication and custom work (wiring, mounts, cooling system, exhaust, etc.) include:
* Other Ford V6s (of similar displacement): You might find some success with other Ford 3.8L V6s, especially those from the same era (late 80s-mid 90s). However, even then, expect significant adaptation.
* Other Ford V8s: Fitting a Ford V8 would be much more challenging, requiring significant chassis modifications, custom engine mounts, and potentially a new transmission. The size and weight differences would also affect handling and balance.
* Other manufacturer's engines: This is the most difficult option. Adapting a non-Ford engine would demand immense custom fabrication and potentially necessitate extensive modifications to the chassis and drivetrain.
In short: While technically other engines *could* be installed, it's a major project requiring significant mechanical skill, fabrication expertise, and a considerable budget. It's far from a straightforward swap. Sticking with a similar displacement and architecture (like a different 3.8L V6) would be the easiest route, but still very complex.
