The Craigslist ad lists the engine as a "4.9L V6 " Ford actually offered a 4.9 liter inline six in the 1994 Econoline.
The Ford 300 straight six (4.9) is a very capable engine known for its longevity , ease of maintenance and abundance of low end torque.
UPS used this very same engine to power their fleet of brown delivery vans.
Bbasso You are probably thinking of the 4.2 liter Essex V6 that was introduced in the Econoline in 1997 , which is underpowered for such a heavy vehicle .
2007 E250 Super Duty cargo
1988 Toyota Van 4x4 5-spd