I had a 1990 LX 5.0 and did somo similar modifications. GT 40 intake, heads, cams, headders,exhaust and gears. Car ran a 14.0 stock at 95 MPH after the mods it ran a 12.5 109 mph. Stock RWHP was 198 RWHP and after the mods it made 335 rwhp. People forget, that the LX weighed 3000 lbs.