* Engine Management: The biggest hurdle is the difference in engine management systems. The 1983 engine uses carburetors with a very simple system, while the 1989 engine uses a sophisticated fuel injection system with its own computer (ECU), sensors, and wiring harness. You'll need the entire harness, ECU, sensors, and possibly even the instrument cluster from the 1989 car.
* Transmission: The transmissions are likely not interchangeable. Even if the bolt patterns matched, the internal components and gear ratios would likely be different, requiring a complete transmission swap.
* Mounting Points: While the engine bays are generally similar, there's no guarantee that the 2.0L engine will mount perfectly without modifications. You might need custom mounts or significant fabrication.
* Exhaust System: The exhaust manifolds and systems are entirely different and won't be compatible.
* Wiring Harness: As mentioned, the wiring harness is completely different, requiring extensive rewiring of the entire car. This is a major undertaking and would be a significant challenge for even experienced mechanics.
* Cooling System: The cooling systems will likely be different, requiring a new radiator, hoses, and possibly even a different thermostat housing.
In short: While technically *possible*, this swap is a very ambitious project requiring extensive mechanical knowledge, fabrication skills, and a significant amount of time and money. It's far beyond a simple engine swap. It's much more akin to building a custom car than simply replacing an engine. Unless you have extensive experience with automotive mechanics and electronics, it's not recommended.
