Lowering 72 Chev 1/3

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Originally, I thought I needed to drop my truck 3/5 to get it level, but now that I look at this page at LMC, it appears I only need a 1/3. Should I still get spindles if I'm not going over 3" on the front? How much will lowering it effect the ride quality? Hard to install? I don't mind putting the spindles in but if the ride quality is basically going to be the same, I can't justify the additional cost or time. Also, since this is a mild drop, will I just need the springs or will I need lowering shocks? I know this is a lot of questions and I appreciate any replies.