Clean the stuff up and that car should run a TON better. I've seen throttle bodies that bad with a lot less miles. Looks like it hasn't been taken care of. What engine did the car come with? It looked like there may be enough left of the t-stat housing to get a longer bolt and put a nut on the end to help tighten it up better. A least it looks that way. I have had a repair like that hold a LONG time (10 years, over 100,000 miles).