Does E250 Ford van has ditributer cap?

No, a 1980s Ford E-250 van (assuming that's what you mean by "E250 Ford van") with a gasoline engine would not have a distributor cap in the same way that earlier vehicles did. By that time, Ford was transitioning to electronic ignition systems, which don't use distributor caps and rotors. They use electronic control modules to time the spark. There's a possibility of a very early 1980s model still having points and a distributor cap, but it's less likely.