Why use the longer front hanger for the shorter SS springs? The shorter stock hanger and stock springs should work better...same reason the fast cars are going to the longer chevy leaf springs.
FWIW...I use stock length springs and stock hangers on my cuda. Been 1.320 sixty foot footbraking at 3800 lbs. on a 295-65 drag radial.
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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