class performance products came out with a cool kit...... standard height or drop spindles for 67-70 a arms but use 73-87 ball joints outer tie rods adjuster sleeves and some other stuff.... than all you need is 73-87 rotors and calipers and your good to go costs 269 bucks
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www.xframeimpala.com
68 4x4 short fleetside deluxe cab 327 air
56 big window short stepside 235 dual 1 brls
64ImpalaSS 327
70 C10 LWB fleetside custom/10 350/TH350