Depends on your entire suspension setup... but my recommendation that's inexpensive too is 9.5" circle track springs up front with the hidden adjusters, probably around 650#/in, and out back 5.5" x 11" or 12" circle track springs (depending on what ride height you want, the 11" are pretty low) in the 175#/in range.
The whole setup will cost you around $250.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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