The Pro-Kit is a progressive rate spring where as the Sportline is a specific rate spring.
Not sure how your road surfaces are up there, but here in PA they are terrible. I went with the Eibach Pro-Kit and Bilsteins shocks on my Tbird and couldn't have been happier. Handling and looks were improved 5 fold, and the car still took up the rough parts with not much drama.
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'97 T-bird LX 4.6L 2V, auto
SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more
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