Yeah, they always "sound" good. They look even better when you get a one minute video of it running but it doesn't really tell you anything. I worked for a very large US company selling such engines (we had to replace them all the time)... trust me, if you buy one, rebuild it before you ever drop it in. It's not just about cylinders pitting or the head gasket going out either, there are a lot of seals and hoses throughout the engine which age poorly. I'm not saying don't do it, I'm just saying that whatever you put in should be rebuilt accordingly.
Once in a blue moon you get lucky as hell though. A few years back a guy on Supra Forums was tearing down his JDM sourced engine to rebuild before installing and found it had not only been freshly rebuilt but VERY thoroughly upgraded.
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