I've got an overheating problem in my 1.3L - I think I just need to replace the head gasket ($70 fix), but it got me thinking... when my 1.3L does finally give out, what engine do I want to put in her?
I know of the following swaps:
1.6L "Stroker" from a Tracker / SidekickDoesn't require much modification from what I understand. Just a mounting kit, and modification of the oil pan / oil dilevery or some kind of a lift kit to clear the steering components. The popularity of this swap into the sami, and it's small size leave it wide open for bolt-ons like headers, A/C, power steering etc. You can even take the fuel injection with you (though this is appairently a wiring nightmare) or use the old 1.3L head if you want to stay naturally aspired... or any fun combination of heads / FI really.
Turbo / Supercharge It:There's some good discussions out there already about Turbo vs Supercharged, and I don't want to re-hash the subject here. However, it's worth mentioning that this is a potential upgrade. There are no "bolt on" kits however, so be prepaired to make your own forced induction system. Aslo - forced induction tends to shorten the lifespan of a motor (some have said it doesn't, but I've never seen a turbo'd vehicle out last NA. It's been my experience that it usually cuts the life in 1/2... with the exception of diesel wich loves forced induction).
Toyota 22rThe 22r is pretty bulletproof, but it's usually a lot of $$$ and hard to fit into our Samurai. Also, it's one of the heaviest 4 Cyl motors out there, (so you'll have to do suspension mods, and you'll loose weight advantage, be more top heavy...). Appairently this isn't a good option when you consider what other motors can get stuffed in the Sami.
Chevy V6Appairently there's a series of V6 engines from Chevy that can get stuffed into our Sami's. From what I understand it's GREAT power, and is about as powerful of a drivetrain as a Samurai can get.
Cons: Very little room in engine bay left for repairs or other upgrades, bad gas mileage and added weight.
1.6L & 1.9L VW dieselsThese little work horses seem to produce great torque at low RPM (good for wheeling). They're also great on gas, and engine mounting kits are readily available (though in my opinion expensive |removethispart|@ $500-$800US). However, this cost is offset, because you won't need gear reduction - in fact - it's better to NOT get a gear reduction, as it will keep the engines in their power band.
2.4L Mercedes DieselAppairently this is a tight squeeze (may require re-locating radiator, and modifying the firewall). What you get is one of the longest lasting engines of all times (Mercedes has the longest running street engines ever - several have broke the 1 Million mile marker) and great low end torque. Appairently the gas mileage isn't quite as good at the VW, and MB parts are more expensive... but the MB Diesels are tanks. They'll outlive the cockroaches.
I've also heard of someone stuffing a Mazda rotery engine (seems like an odd choice, since rotaries get their power from high RPM), and also heard of someone using some kind of sporty Suzuki Swift engine (DOHC Turbo?). Though these may be urban legends for all I know.
Of Note:
The only thing I know of that we can legally do in California is the 1.6L swap (still need to get CHP to "ref" the upgrade - this means fees). I believe the other swaps are too "radical" for CHP to approve them

I'm a bit of a noob, so sorry if I have got some of my facts wrong. Let me know what other swaps you have done / know can be done. Fell free to post links / writeups / how-to's - lets discuss!
~J~