Here's why:
* Engine Management System (EMS): The 1995 3.5L likely uses a different EMS than the 1998 3.2L. The wiring harnesses, sensors, and computer are not interchangeable. This would require extensive rewiring and potentially a custom solution, which is complex and expensive.
* Mounting Points: While the overall engine bay might seem similar, minor differences in mounting points and accessory locations are possible between the two engines and years. This could require significant modification to the engine mounts or even the chassis.
* Transmission Compatibility: The transmissions used with the 3.5L and 3.2L engines might not be directly compatible. Even if the transmission *appears* to be the same, internal differences could cause problems.
* Exhaust System: The exhaust manifolds and piping are likely different and won't fit.
In short, while it might *seem* possible at first glance due to being the same car make and model, the practical difficulties and expense of making the swap are prohibitive. It would likely be far more cost-effective and simpler to either rebuild or replace the 3.2L engine with a compatible used or rebuilt 3.2L.
