If the car is already set up with Chevy mounts, the LT1 will bolt right in. The '98 LS1 uses a different mount position. The trans mount may need to be changed depending on what was in there before, but that shouldn't be too hard.

The computer in the Camaro also operates the electronics for the automatic trans. You can you use the OEM harness, or a place like Painless or Ron Francis have stand-alone harnesses.

Items I would watch for is a compatible fuel system with a high volumn electric pump, and I believe you'll need a seperate return line back to the tank.

The electronics also use a Vehicle Speed Sensor (VSS) instead to a gear in the transmission to operate the speedometer. You can have the speedometer changed to an electronic unit, or you can get a converter. Also, has you won't need converters, you won't need all four O2 sensors. You'll need two to allow the system to compensate, but you can get two O2 simulators two trick the computer. After the installation, you can have the computer tuned to compensate for any changes.