Heads and a full 60K and it should be fine for a DD. Done 4 like this. The issues you will have is not knowing if the motor had rod knock, spun bearing or other issues that the owner was un awhere of. You may end up doing all this work for not.
Just let the owner know that he is rolling the dice by not doing a full rebuild, so as to keep you neck off the chopping block. LOL.