Your best bet would be to:
* Verify the engine code: Double-check the engine code on your van's engine block. There might be a misunderstanding about the engine type. A photo would be helpful in confirming this.
* Search for used engines: Contact classic Ford parts suppliers or breakers' yards specializing in older Transit vans. They might have a suitable replacement engine of the correct inline configuration, but not a V4.
* Engine rebuilding: If you can identify the correct engine, consider having it rebuilt by a specialist engine shop. This is often a more cost-effective solution than finding a used replacement.
In short, focusing your search on a specific V4 2-cylinder engine is a dead end. You need to accurately identify the existing engine type and then seek a replacement or rebuild of that specific engine.