Unless it has a lot of sentimental value to you, I'd steer clear of it. Looks like some money needs to go into it and it'll add up quick.
Here's a 90 in Mobile, AL. Mint looking interior, body and paint look good, driveable, but has a knocking motor. 107k miles. $500. If I had room to store it, I'd keep it just for parts for my '92. Someone with the time could probably fix the knock or replace the motor and have a very nice G50.
http://mobile.craigslist.org/cto/4926247365.html