The 10 bolt seems like an easy route. It will hold up to that hp/torque without any breakage if you go with the 'C' clip eliminators and a good set of gears. The 28 spline axles would be your weak point, but will still be plenty for that hp/torque. I vote for re-using or freshening up what you already have. Remember there will be a hidden cost for parts and fabricating the new 12 bolt or 9" with perches etc. to fit under the car.
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