Personally, I'd do a little bit of both. I have a 66 shortbed stepside, but i have the little back window. Go to a local car club, cruise-in, or show and see what other people have done to get some ideas. I'm planning on dropping mine 2" front and rear and leaving the exterior stock. Its just a matter of your own preferences, but make sure to keep us posted on your progress!
Drew
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'66 C-10 stepside