I dont think so matt i might be wrong but the most powerful zetec turbo in the uk was will gallops rally cross engine at a genuine 650bhp , then devil development 590 odd bhp engine , then paul johnsons at 570bhp then dan arrowsmith at 533bhp then me i think at 522bhp.
The only geunine cars i know that run over that figures shaun carlsons drag focus from america 800/1000bhp and syzbk drag racing escort. Both these cars run none standard zetec parts ie custom made heads or early ford development heads which are like rocking horse shit to get a picture of never mind owning one.
Like i said i would be genuinely interested to see specs and pics of any of these 800 bhp engines

Cheers paul