Its pritty simple get the shell you want to keep and strip it down bare and get the other car next to it and take the eninge and gearbox and shafts out as one lump then remove the mounts and stick them in the new shell the just drop in the new eninge setup and then do the eninge bay loom and so on.
yes you can but you need to cut off a small bit of the manifold flange on the left hand side and you will also need the 1.7 brake servo pipe.
as for a remap bluefin super chips will sell you one for 300 iirc but its not worth it on a 1.4 really.