What sort of power are you hoping to make. For a good street setup with good fuel economy, i would go about 9.2-9.4:1 c/r, stock r33 rb25 cams. Stock inlet manifold gt3076 1.06 on a stock manifold or a 3582 1.06 on something aftermarket. Just need to remember you wont be able to run big boost numbers, so you may wish to run a slightly bigger turbo than your power wishes.
Your only other issue as cubes said is the gearing, as freeway speeds is just revving too high to get great economy, But 8l/100km is still pretty good.