Unless you are a complete tool - just get each car side by side and swap everything over - everything fits and you need only connect up 5 wires from the frst loom into your existing loom.

You will need an external swirlpot or fuel tank with swirl pot/fuel return and a cossie/rst pump and you will need to bastardise an frst system to fit the xr2 floorpan - dont use the xr2 exhaust system its too restrictive.

hth - failing that post on xrtwo.com forums and someone may do it for you if they are nearby - but it really is a case of swapping stuff over which isnt exactly rocket science.