210k on the clock on your almost free van you say?
Has the trans been replaced during that time? That seems to be the big ticket item on vans with that many miles. How it was treated for the first 150k miles will determine how many more before it needs a trans rebuild.
What engine? The V10's seem to last a long time if cared for. Again, depends on how it was cared for, if it got routine maintenance or not.
I wouldn't fall into the trap of "I'm not putting 3-times what I paid for it into <project x-y-z>!" Heck, new tires and 4 wheel brakes will cost $1500.
If you are the kind of guy who keeps things, what you paid and it's resale value is almost irrelevant.
Lastly, you're on this forum, by definition, you're at least a little crazy