well you should probably drop the idea of a rb26...unless you have some serious cash...@6000us just for the clip and a lot of modding to make it fit, obviously you are new this seems to be everyones first question....Everything you need comes in a front clip....transmission,I/C,Ecu,...blah blah blahif you want info on the swaps, most of it is pretty vague, because people dont really want to let the cat out of the bag, It can be found using the almighty search button and yahoo or google...
http://www.venus-auto.comhttp://www.srs ... ......hate to put it up but they have an arseload of links that will help you on your journey of which engine to choose.
also you might want to consider the RB20DET, or the RB25DETand you're gonna want to stay away from the s-15 SR20(once again alot of modding to make it work) and its expensive
once you really start looking you're gonna get a headache with all the possible setups and what power what makes.....and this thread is probably gonna turn into another which engine is better thread.
So did you have a honda? welcome to the darkside.and feel free to fight fire with fire because you will probable feel some heat.