The pic's of your truck are deceiving, I was thinking you had at least 4" or 5". I'm thinking of going with 2" HD springs all around + a 1" add a leaf. That should give me roughly what you have for lift.
I may also upgrade to the heavy duty hangers on the rear. I haven't figured out why some trucks have larger hangers, but as near as I can tell the 69's have a smaller hanger than 70, 71 & 72. The heavy duty units drop the front of the rear spring about 2" which would add about another 1" of lift.
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Eric
1969 K20, 465/205 package
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