yeh it'll fit, you'll need to extend the loom about 1.5m for the ecu to sit down in the passenger footwell, like your current one should, and you'll need a mk5 cvh engine mount (i have 2 spare's) and if your wanting power steering, you'll need a cvh p/s pump, (which i also have) other than that it's all pretty straight forward
join....
www.escortevolution.co.uk couple of people on there already have rsv's