I wouldn't pay $6500 for that engine and trans even though I'm sure the guy spent a lot more than that to build it. The problem is that some of the information is incorrect so that makes you wonder what is what. Plus the engine in the picture doesn't appear to be well cared for. It has rust on it and it appears to have been sitting for a while. As pointed out before, Stage VI heads have a bad reputation. Maybe those heads are good ones, maybe they aren't. I suppose you have to go look at it in person and talk to the owner to know for sure. Good luck.