Dude I have 119k, I got it with 105k, and it runs like new. The only thing I've replaced is the IAC, but who hasn't heh. Anyways, these engines will last a very long time, but you gotta change the oil and don't do stupid stuff. Even in the summer, let it run a good 3 minutes before you go, like me, I listen to one full song.
Anyways, all tests and everything and you would think my car has less than 50k on it. The previous owner bought it new, had it until january of '04, sat at my local chevy dealer until I got it in february '05. He took such good care it's remarkable, the only thing not perfect, with the entire car, is the silver parts of the leather seats, where ur butt sits, that's it. This thing feels like it will last forever. I've never even heard of anyone blowing a head gasket. And to be honest, once you pass 100k, IMO, the only thing that might be at risk is the head gasket, I mean, what else can break? And for me, I drive very very perfect, I've never had to replace a clutch, in a total of about, well, over 1 million miles driven total in all my cars. That, plus I don't abuse the synchros, I can get over 200k out of this car, like I did 3 others, and I'm sure you can to. Just take care of it, don't downshift constantly, sometimes let the brake pads take the beating, they're cheap and who cares! Also, if the check engine light comes on, actually do something about it. Other than that, don't be LAZY!!! Most engine failures can be prevented, it's sad. Everytime you change your oil pay attention to what's used, if any, also watch other fluids, and most important, always run with good, clean coolant. Crappy coolant is the worst thing man, will eat up ur head gasket in no time. Btw, it's extremely easy to flush and change yourself, just takes some time, but who can't spare 3 hours on a nice day, to take care of ur baby?