I think you need to do some research - on perfromance modifications in general, so that you can better understand what does what, performance wise.
Most people would not use the word bigger when describing a camshaft, you'll hear terms like "high lift" (lifts the valves higher (sort of like opening a door all the way, rather than half way) and "longer duration" (like opening the door for two minutes instead of one), and even "high overlap" (now you have to think of two doors, and you increase the time that they are both open).
There are higher perfomance camshafts available for your engine, but the cam shaft is only one part of the equation, intake, exhaust, fuelling, all will need to be improved to get the full benefit of a new cam - and - perhaps even more importantly - factory cams are designed to provide a balance of power, drivability and economy.
You need to take into consideration how the vehicle is going to be used, a camshaft that provides maximum horse power is going to do so at high rpm, and sacrifice power low down, making the vehicle a nightmare to drive in heavy traffic and perhaps unusable off road (depends on the nature of your off roading).
Like loosenut says - you're not going to get a 40 hp increase by swapping in a sedan cam - swap the entire engine - maybe.
93 - 1.3 Suzuki Swift GLX
98 - 1.8 Mitsubishi Pajero iO
98 - 2.0 Suzuki Grand Vitara