I have to agree with Spectral, it would be cheaper to rebuild the engine u have, with forgies, stroke it and new cams, etc.
Then at a later date or at the same time put a turbo on. Engine management system, exaust upgrade. And while you're doing the upgrade don't forget about upgrading ur brakes.
If u really think that u need to change engine look in to what engines bolt in. Wide cams, larger capacity, etc. Its not the best to just go that engine is good i want it in this car.