The E16 means that it is a SuperVan, which is the extended length van.

F means a 170 cui six-cylinder engine

H means the van was assembled in Lorain, Ohio, which is where all of them were made.

The rest of the numbers indicates it was built in September 1965 for a 1966 model.

If you enter the rest of the data on the door plate, that could be decoded here as well.