It's a Zetec, it's part of Fords badging shite that they do, for example new fiesta, the only duratec they use is the ST150 engine, but they're all badged as Duratecs even tho the rest are Zetecs.

It'll fit the 2.0 / 2.3 Duratec HE engine, as found in Focus/Fiesta/Mondy

It might be worth finding a Mazda, some of them use turbo'd duratec HE's so that'd be a good base to plan your engine on