the engines are basicly the same
but the blocks are tapped for either rwd of fwd applications so if you get one, get one from the correct vehicle

you also need to think about losing the balancer shafts on the fwd cars and bolting on a normal sump, but then you have to find somethng to blank the oil feed hole to the balancers and add a bit of the block where it's been relived for them to fit into
everything else will just bolt into place and you can then use the rs2k cams and away you go

edis is going to be a simple thing to arrange as they fire coil packs in the head rather than seperate so all you need is a driver or megasquirt it (or use the rs2k loom with bigger injectors)