2007 chrysler town country minivan used - needs engine work

The good:
Only 91,000 Miles, only two small rust spots on rear wheel wells, no dents or scratches, clean interior, 3.8L power, tow package, stow and go seating, all seats fold flat for huge cargo room, seats 7, old snows on it now and includes a set of good summer tires.
The bad:
It needs engine work in order to be worthy of long distance travel. There is an engine knock that will require someone to diagnose and repair. I really don't know what it is and I don't need a big vehicle anymore so I'm selling. We've been driving it locally for 6 months with no problems. There are no check engine lights on so it could be inspected if your mechanic is okay with the knock. The rest of the vehicle is in really good condition.
This is a great vehicle for someone who can get into engine work or has a reasonably priced mechanic. Or a good vehicle for a used car dealer or salvage yard to swap motors and flip it.
Book value if it were perfect is $4,200. I'm looking for $1,000. I have 4 vehicles in the driveway and need to move this one.