1998 Chevrolet Camaro Chevy Z28

Hi my mom has a 1998 Chevy Camaro Z28. Unfortunately the motor went one of the valve lifters were tapping. We said forget replacing it we will just drive it until it goes. So that's what happened. So now we are looking at motors. We have been told LS1 motors are no longer made they are all remanufactured but have a 3 year 100,000 mile warranty on it which is not bad and it is a jasper motor which I like anyways. So we have also been told you can put an LS2 motor in. I know the motor mounts would have to be changed and I would say the computer would have to be reprogrammed most likely. This car is automatic. What else would have to be done for an LS2 motor to be installed and is it really safe. Thanks.