A modern timing chain should last near the life of the engine. Lack of maintenance will kill them quicker (along with the rest of the engine). Barring a defect from Ford, I'd be really worried about putting a timing chain in one of these engines. Mainly because you would be doing a lot of work to an engine that has suffered and worn as much as the chain.
Toyota has interference engines too. Their timing belt engies are typically not. Many of the newer timing chain engines are interference.
All the worry about timing chains has come from poor designs and old technology that left many engines with chains that failed before they were worn out. Ford, GM, and Mercedes all had a few engines with a bad reputation in the past for timing chain failures. With modern oiling designs, hydraulic tensioners, and better chains that should last.
The interference isssue should be a moot point. By the time the chain fails and the valves hit the pistons, you need an engine anyway.