Typical RWHP numbers for my combination?

What would be a typical rear wheel horsepower number for my combination? I have a 97 GT with a few small changes:
PI cams
PI intake
offroad H pipe
Tuned (tuned the AFs, added timing and running E85 )
drop in K&N & underdrive pulleys

I was thinking around 235-240 rwhp? Any example dyno graphs of similar setups?

I ask because I am doing a related project at school. I did some datalogging to calculate the acceleration my car. From that data, and the specifications of the car, I can calculate the road load, and find the power curve of the engine. My calculations came up with ~270rwhp, which is obviously high, but I was thinking I don't really know what my combination should actually make. Ohh, and I am sure my model indicates high because of the assumptions for road load and mass factor (especially mass factor).

I found an error in my calculation and corrected it. Now, based on acceleration I am calculating 236rwhp at 5000rpm and 276 ft/lbs of torque at 3700rpm. Does that sound insanely CLOSE or what? haha Amazing when math actually works.