Wow... well, unless you do some serious rebuilding it will be pretty hard to get those numbers from a 1.5. But, yeah, you can get a few horses from the cam, gear and pulleys because supposedly the crank works faster. You gotta keep an eye on your electronics though. I've heard many stories of people with pulleys killing their cars cuz the alternator won't charge the battery fast enough. In my case, it was bad mechanics, not parts. I now have a lightened flywheel and exedy street/strip clutch but the gains are not very noticeable even though I've balanced out the engine dynamics on both sides. Here are some links though...
clutch/flywheel combo
http://www.clutchcityonline.com/ComboHome.htm
pistons
http://www.racetep.com/hondasrp.html
good luck