you can't work out how much power you have just from displacement. you will need to dyno test your car if you want an accurate measure.

for an accurate measure you need a dyno to calculate an estimated hp you need alot more things.  IE max compression, combustion chamber displacement.  ignition timing, exhaust timing, intake timing, intake and exhaust flow resistance.

And then you need a mechanical engineer who knows what he's doing to help you through some god awful calculations that will still be inaccurate.

Stock though I think you should be getting abouts 207 horsepower with its maximum 238 lb-ft of torque.