since your posting in the n/a forum, im guessing you dont want to go turbo... You need to bump up the compression get a moderate size cam and then run spray. It'll take alot of money and work to make the single cam reach 200whp n/a i.e. larger bore, make it a stroker motor, big cam, and lots of head work and tuning. I'll be happy with 140-150whp out of my setup that I'm working on now.