* Extensive modifications to the engine bay: You'd likely need to modify or replace the firewall, possibly the radiator support, and definitely the hood. Custom headers and exhaust would also be essential.
* Transmission considerations: The stock transmission likely won't be strong enough to handle the torque of a 454. You would need a more robust transmission and possibly a custom driveshaft.
* Cooling system upgrades: A 454 generates significantly more heat than the stock engine; an upgraded radiator and cooling system are crucial.
* Suspension and chassis reinforcement: The extra weight of the 454 will put increased stress on the chassis and suspension. Reinforcements might be needed.
In short, while not impossible, fitting a 454 into a 1990 Corvette is a major undertaking requiring significant mechanical expertise, fabrication skills, and a considerable budget. It's not a simple bolt-in swap.
