I'd definitely use Calvert's mono springs.
The Assassin bars offer more adjustability and are a simpler install. Less clearance issues if you have the inboard spring kit.
Calvert Racing is an awesome company to deal with though. I have Cal-Tracs...bought them long before the Assassin bars came out.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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