One of my best friends had a "90 LX 5 speed that he raced at Alamo dragway with MT 275-60-15 street slicks. He ran consistent 11:27/11:28 ets, and he asked me to watch his launch. First thing I told him was he had to drop the tire pressure down from 28 psi to about 14, but he was afraid. He had heard that it would get squirrely at the finish line with that low pressure. I convinced him to drop it down to 22 psi, and he immediately went 11:14. I talked him into dropping it more, and upping the starting rpm from 4400 to 4800, and he went 11:00ish. I finally convinced him to drop down to 14psi, and leave the line at 5400rpm, shift at 6800 with chip, and he went 10:76 @ 133+. He repeated that with 3 runs, 10:75, 10:78, 10:76 and broke a 28 spline axle. Changed to 31 spline axles the next week, and ran that way for years. On my own personal drag car, I ran 29.5 x 11.5 x 15 slicks with 7.25psi with tubes. It takes many years of practice to find what works on your car, especially if you only take it to the track once in a while.
I think you need more camshaft, and at least long tube headers, 3.90 gears, and 2.5 inch exhausts with H or X pipe for you to get into the 13 second range. The next step is mental. Do you want a street car, or a race car? Joe-JDC