* Motor Mounts: Custom motor mounts are absolutely necessary. The 350 is much larger than the stock engine.
* Transmission Adaptor: You'll need an adapter to mate the Chevy transmission to the Jeep's transfer case.
* Driveshafts: The driveshafts will likely need to be shortened or replaced to accommodate the new engine's position.
* Exhaust System: A completely new exhaust system will be required.
* Wiring Harness: The wiring harness will need to be modified or replaced to accommodate the different engine.
* Radiator: A larger radiator might be necessary to handle the increased heat output of the V8.
* Cooling System: Potentially significant modifications to the cooling system.
* Body Modifications: You might need to do some minor body modifications, especially in the engine bay, to provide clearance for the larger engine.
The project is complex and requires significant mechanical expertise and fabrication skills. It's not a job for a beginner. The cost of parts and labor can quickly escalate. While it *can* be done, it's a substantial undertaking.