use your original gearbox,
fuel pump will be fine aslong as your not turboing the zetec,
use mk4 rad as it fits better and will perform as well as the zetec one,
existing edis module is fine aswell.

would also recommend using a fiesta mk3 alternator bracket with the original escort alternator, with the v belt pulley from zetec alternator and the belt from a non power steering zetec xr2i