I am sorry you got screwed but I swear 8 out of 10 threads on here are the same exact thing. "It's not what he said it was and when I confronted him he said That's what he was told."
If someone won't let you pull the pan and one head before you buy an engine then keep looking...after all, it's worth $100 wiorth of gaskets to know you are getting what you are paying for. I would N E V E R!!!! BUY a used engine that was assembled.