To know for sure, you'd need to:
* Find the bolt pattern for both the Camaro rims and the Lexus SC400. This is usually a number like "5x114.3" (meaning 5 lug nuts on a circle with a diameter of 114.3mm). You can find this information online (many wheel and tire sites have databases) or on the rims themselves (often stamped).
* Check the center bore diameter. This needs to be compatible or slightly larger than the hub on your Lexus. A too-small center bore is unsafe.
* Compare the wheel offset. Offset affects how far the wheel sits in or out from the hub. A significant difference can cause rubbing issues with suspension components or the wheel well.
Even if the bolt pattern is the same, the other factors (center bore and offset) might still prevent a fit. You should always verify compatibility before attempting to mount wheels. A tire professional can help you determine if the wheels are a safe fit.