the swift gt has a dohc engine instead of the sohc engine that is in the normal 1.3L and it has a lot more aggressive cam. Plus the sohc has 3.52 gears compared to the 4.39 i think in the dohc.
It would be a pretty easy swap to get a 1.6L rwd tracker/sidekick and stick it in pretty much anything. They are small engines and fairly common. Plus you could always find someone to grind the cam down to a lower lift and duration to give it more bottom end power than stock and put 2.73 rear end gears in it for really nice tall gearing.
But a 3 cyl would be much more unique in that car. You could always put a second one in to double the power when you need it
