It most definately is 168K miles. I took a looksy in the valve cover today and found that the valve cover does in fact still have the hole in it. I'm going to say it's safe to assume that the repair hasn't been done to this van.
On another note, I stopped into my local Ford dealer today to ask about parts and get another key fob and key cut, and the sales person that I was dealing with there was in the shop at the time. Apparently he is upset that I didn't buy the van from him. This kind of really sucks because I teach high school autos and we compete in the Ford/AAA Auto Skills contest every year and he has always been the one that got me a car for my students to practice on. I sure hope he's not mad anymore when competition time comes around. It's not that I don't appreciate what he does for me every year, but it came down to a matter of dollars and cents. I could get this van $3k cheaper than any he had, and I'm on a tight budget with a 3rd kid on the way. What will be, will be I guess. Thanks for all the help folks it's really helping me out.