* Engine Mounts: The engine mounts are different. You'll need to either fabricate custom mounts or adapt existing ones.
* Transmission: The 1998 Vortec 350 likely came with a 4L60E transmission (or possibly a 4L80E depending on the application). Your 1993 Caprice likely has a 700R4 or 4L60E (though less likely). Even if the same transmission type, there will be differences and compatibility needs to be verified. The transmission's bellhousing bolt pattern may not match the engine.
* Computer/Wiring Harness: The 1998 engine's computer (PCM) and wiring harness are incompatible with the 1993 Caprice's system. You'll need a custom wiring harness, potentially a standalone engine management system (like Megasquirt), or a significant amount of rewiring to integrate the new engine's computer.
* Exhaust System: The exhaust manifolds and piping won't match up. A custom exhaust system will be needed.
* Accessories: The power steering pump, alternator, and other accessories might require modification or replacement to fit the new engine and the Caprice's existing systems.
* Cooling System: There may be differences in the radiator and coolant system requiring changes.
* Drive Shaft: The driveshaft might need to be modified or replaced to accommodate the transmission and rear differential.
In short, while it's *doable*, it's a major project that requires significant mechanical skill, fabrication abilities, and potentially specialized tools and knowledge of automotive electrical systems. It's not something a novice mechanic should attempt. It's a much more complex swap than simply dropping in a replacement engine of the same generation. Expect to invest considerable time and money.
