Here's why:
* Size and Weight: The 350 is considerably larger and heavier than the Fiero's original engine. This requires significant modifications to the engine bay, including likely needing to modify or replace the firewall, possibly widening the wheel wells, and strengthening the chassis to handle the added weight.
* Transmission: You'll need a transmission that can handle the 350's power, along with a custom driveshaft. The stock Fiero transmission isn't suitable.
* Suspension and Brakes: The extra weight necessitates upgrades to the suspension and braking systems to maintain safe handling and stopping power.
* Cooling: The 350 will require a more robust cooling system than the Fiero originally had.
* Exhaust: A custom exhaust system will be required.
* Wiring: The electrical systems will need to be adapted to accommodate the new engine.
In short, while it's *possible* to fit a Chevy 350 into a 1985 Fiero, it's a major project requiring significant mechanical skills, fabrication abilities, and potentially thousands of dollars in parts and labor. It's not a project for a beginner. Many people who attempt this swap end up spending far more time and money than initially anticipated.
