ok I have the mods you say should get you to 200 whp and believe me when I say we thought it would get us closer then it did. all we could do was gain a butt load of mid range power lol. peak power just doesnt wanna come easy.
I'd say to hit the 200 whp mark you'd need the following things... (this would be the minimum to even try)
3) power fc
4) new springs/valves
5) up the compression to 13:1
6) new oil pump for safety
7) 100 octane and a nice aggressive tune.
you could stroke it but you'll mostly gain more torque I bet.
and driving on 91 octane may or may not be possible. if you do you'll have to run a much less aggressive tune and sacrifice a bit of hp.
closest I could get was 185 whp and 136 wtq. stock I dynoed 151 and 112.