the shift kit and stall converter will be the biggest thing that will help you. you might want to look into a higher rpm converter? maybe about 3000rpm's, and go with precision industries. i ran a 14.9 with stock gears, and a few more mods (see sig). i think with the converter and shift kit along with the reduced weight, you could see 14.5
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89 GT AOD w/ shift kit, B&M rachet shifter, Trickflow intake, Crane (E-type) cam, 70Tb, 75MAF, 1.6 Rockers, Pulleys, MAC headers and H-pipe, Dynomax mufflers, K&N, 3 core radiator, white face gauges, custom interior, cobra R rims. 14.9 at 95.07mph with stock 2.73's.
89LX 2.3 Notch, daily beater!
MY89GT