Some days I just have to say something.
More horsepower IS more torque, and vice versa. When an engine combination is close to it's design limit, you can move your torque peak around with cam/exhaust/intake timing. WHERE do you want to make more torque?
Second, gearing shorter DOES increase actual torque applied to the tire, the trade off being that it removes some potential top speed. It's WHY we have transmissions in the first place, and it's also why the lower gears accelerate much more quickly than the higher gears (more effective torque).
Want more torque everywhere? Gearing. Want more torque AND top speed? increase the design capability of the system. Easiest ways: nitrous, turbo, big-bore, more stroke, better fuels, higher static compression.... all assuming you re-tune to suit.
Want to move your torque around? Play around with cams and cam timing.... may even find some 'free' power in there if you do it right.
Attack life... it's going to kill you anyway.