Quite commonly done, but I don't think it'd make any positive difference, especially since your ECU won't know about it.
What people usually do is also use the throttle-body and MAF sensor from a 2 litre (plus the cams you already have), and an ECU from an RS1800 Fiesta. The theory is, since those are the changes made to the RS1800, 130 brake should be achievable on any 1.8 Zetec.
Personally, I cannot vouch for any performance improvement.