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I would go buy an automatic transmission counterweight for an 85 GSL-SE and use and aftermarket flywheel.
I don't know how to tell them apart, but when I get back home (I am traveling for work right now) I can at least weigh up the flywheel weights from an '86 and a '90, maybe you can identify them by weight.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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