If its a mk3.5 it would be an xr2i not an xr2 wouldnt it which means its easier as the later models came with a zetec engine fitted so you would just have to buy a later model zetec engine mount out of say an rs1800 and away you go.
If it is an xr2 you just use the cvh mount 2 bolt holes line up to the zetec block the third hole very nearly lines up it just a case of chopping it off re-positioning it and welding it back on.
Hope that helps you Mark.