Define good? $200 you can't really complain. At that price, I'd go ordering new gaskets immediately, and cash ready for pistons, machine work, etc, as soon as I could get it apart.

Just look for the good stuff, like Japanese I6s and high demand stuff, 4g6X, S2000 engines, etc,etc. Honestly, it's a tough question to answer without knowing why you want an engine. If possible, I'd start removing heads in the lot.....