Congrats on the new best! My first thought after watching the video is the entire suspension looks too loose to me. A lot of movement. Cal-tracs would definitely be an improvement, but new shocks all around should be on the list too. Maybe just ladder bar it since you already have big tires and tubs. 
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
| 
