If the Storm engine does NOT look identical to the Tracker, the swap is not easy. Some Geo models do not have Suzuki engines.
It is possible to swap a 1.8 or 2.0 l Inline 4 Sidekick engine into your Tracker for more power. Sean DeVinney at Aftermarket4x4.com does that. The larger Suzuki V-6 engines are a tight fit but can be done. These engines require the ECU and the wiring harness to make the swap happen. You might get away with fewer adapters by using your '95 five-speed transmission and swapping the engine with it's 1.8 or 2.0 5-speed bellhousing. The bigger Suzuki engines use hydraulic clutches and all that is built into the bellhousing. Sean has all the details and correct answers if I have my facts wrong...
I suppose you can stick Ford or GM V-6es in your Tracker tintop, but it might be overkill and it does require a lot of fabbing...
VW swaps are common, give you more torque and are a little complicated. For the complete story, go to
http://www.acmeadapters.com/index.php?sound=Y.
I hope that this helps!