Welcome aboard, bolotec!
If you're looking for more power just head into the "Engine" section, there have been many people who have asked the exact some question. You should be able to find anything you want. It seems that, at least from my perspective, the current standard seems to be a reground cam from Schneider Cams, double valve springs from the same company, and a Weber Redline K740 kit, (It's a 32/36 DGEV (electric choke) carb with adapter plate (99004.250 is the part number). Though you could buy the individual parts much cheaper than throwing down the $300 for the kit. (i.e. $100 for a 32/36 on Craigslist and the adapter plate for around $45)
Good luck!