Guessing WHP output is useless. Wait until you get it tuned and see what you make.
And also guessing what you may or may not ruin is useless. The transmission is based on your driving habits (and those of the previous owner if there was one). Clutch is dependent on wear and habits. The rear diff is actually really strong, and you shouldn't see any issue from it accordingly.
For reference I' running a semi built motor, 18G turbo, stock transmission, and only an upgraded clutch because the stock wore out. No issues.