not much on suspension but try checking the shocks might need new ones also a rear sway bar could help
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http://68chevy0.tripod.com/68stepside/
68 Chevy c10 swb stepside 4/7 drop sbc 305 edlebrock performer camp/intake/600cfm ec carb 700r4 tranny 3:07 rear gears 17x8 eagle alloy wheels
Pikeville,Kentucky