Trougtyr,
If you are figuring a weekend worth of work, and want a reliable car, you're going to want to go with a professionally rebuilt 2.4, but don't grab an ebay engine with 100k+ miles or something like that or you'll have what you started with. If you don't know what is involved, I would highly recommend talking to a local shop before you buy or do anything.
While its easy to say that it could easily be done in a weekend (it can be done in an afternoon), it is tough from my position to know how it might play out for you. I don't want to recommend cutting your teeth on this if you're inexperienced with replacing mitsu engines and cause you to be in a tough spot.
If I were you, I would have a shop order a rebuilt engine of the same type and have it installed by them as well. If you are having to ask what is involved in this case, you may be better off.
I'm not sure why you would want to go atomic on your setup just yet, it may be as simple as some sensors that need changing. You didn't really specify, so I just gave you my advice. I hope I helped :)
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