There's some decent free calculators online that can give you an idea of what you'll need to meet your goal. Here's one:
http://www.hotrodpitstop.com/tool.php
Our cars with driver will weigh ~4000 lbs. Putting in my trap speed (109.7) from last Fall yields a ~ 412hp estimate. That should yield a 12.3-12.4 ET, but because the torque converter doesn't lock up in the launching gear there is more drivetrain loss/less hp to the gnd until it gets into 3rd gear (my ET was in the 12.6's, slower than the calculators predict, which I believe is due to the time spent in 2nd gear without the converter locked, and measured GTech data shows less hp to the gnd).
Hope your quest goes well and please keep us informed of the results!