if it hasnt been done you can do it its not to hard. If you do it yourself it'll cost around $400. Im not sure what you mean by "no serious rust" these cars really dont have rust problems at all. Secondly the Bose system sucks so youll want to take it out anyways. At 120K you can expect anything from minor to major things to start going wrong. You may need new turbos which requires removing the engine. Its just like buying any used car you just have to take your chances that whats working now will still be in a few months. Also your Camaro is beautiful, it was actually a toss up between restoring a '68 or getting a 300Z, obviously chose the 300Z for the more practical daily driver.
"If everything seems under control, you're just not going fast enough." - Mario Andretti