Start with 3.73-4.10 Gears I would do 4.10 gears with a t-lok even with a 5-speed personally.
After you get the gears in buy a speedcal to correct your speedo (dont know if a chip will fix a 99+ 5 Speed speedo)
Get an Aluminum Driveshaft, sticky tires, Underdrive Pulley, and a 600-700 Dollar Nitrous
kit and spray a 50 shot. Your motor will handle that with a breeze.
^ Cheapest way right there.