if its a GA16DE with the VCT hump on the intake side, you can wire up a window switch to turn it on and off. Ideally, you want it on during low to mid rpm then off as it advances the intake cam 10 degrees. Its behavior goes... on until about 5000rpm, off, then back on to make you want to shift. you want to keep it off during higher rpm use.
other than that... qg18de headers fit, sr20ecu works if you swap over maf and injectors, advance the timing as the ga16de really responds to this, cai, the typical stuff. you probably wont find cams, pistons, rods, intake manifolds, etc.