Unless things have changed new Ford engines don't have number on them. The idea is you stanp th number off the old engine onto the new one. This is beacuse Ford VIN's include th engine number, keeps it simple.

I bought a brand new Ford crate Zetec about 5 years ago. No number so i did as above. But there were loads of paper stickers on the engine with the date of manufacture of various parts and all these were 2004 meaning the new engine was actully 4 yeasr old.