i wouldnt bother mate, upgrade to full MS and efi the zetec, also a t25 will be a little on the small size if you wish to rev the zetec past 5k, for both montego and ren set ups you will still need a high pressure efi pump and fuel lines, and fuel pressure regulator, so you be as well running a full efi setup, much more tunability. You got bike carbs the now like?