Yes, I remember that thread.
Honestly, I can't tell if it will fit for sure, as I don't even have the engine yet
. What I know is my 2.0i DOHC Sierra engine is already pretty tall.
Also, people replying on LCB are mostly locost/westfield/tiger/etc. builders, with much smaller chassis than the Haynes Roadster, so they can be scared by a tell engine that won't fit their tiny engine bays, but might be able to fit in a Haynes.
I also know that someone on LCB is making the swap to an Ecoboost, but I don't remember what car he has. It is worth a search on LCB.