Looks like you've got gears, exhaust, pullies, and some intake stuff.......I'm sorry to say this, but that IS about what 96-98 GT auto's run with the mods you have.
Those lowering springs and 18" rims are prob. hurting you a little.
My advice would be a 2800-3000 stall and a shift kit.
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1987 Buick T-type
1998 HD Electra Elide
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