You are making nice progress in your build. You will be able to make 250hp easily with your setup and the stock turbo. I have an 83zx turbo and I am not sure how much hp I am making but my friend has a e39 m5 that has 400hp at the crank and he has a couple mods like exhaust and I am dead even with him on a roll. The only things I have done to my car is an intercooler, rising rate fuel pressure regulater, a electronic boost controller, and I have the boost up to 14.5 lbs. So i think you will make your goal easily. Who will be tuning your car?