The biggest issue is the head's being under torqued from the factory. However, as with any old turbo car, if you plan on making power with it, it would need a rebuild anyway. It's not a weakness with the head, etc, only that they were undertorqued to begin with or idiots are racing around in a 20yr old turbo car without proper maintenance. Saying that, he says it's already been rebuilt. With what? I'm not sure.
I have many websites and forum links if you'd like. JUst let me know. Or pm me and fire some questions off me. If you live around the Deleware area and wanna stop by one day, that's fine, too.