I really doubt an '89 Coupe weighs any less than your '82GT, dude.
According to the NADA website, the 86GT weighs in at 3000 lbs, so does the 87 5.0 LX Coupe.
If you are looking to shave 1/2 sec, your gonna need more engine or performance mods. I don't think you're gonna be able to get more than a couple hundo out of the coupe before weight savings gets slim.
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