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If lowering, head over to the Dent forum (73-79) and refer to the tech sticky at the top of the page, then go to the last post in that thread.... mucho threads and sources on lowering.
Chopping... Oy.. IMO, sever chops really throw off the visual proportions of the truck. If at all, I'd only look to do one or two inches at the most. Your call.
Edit: How about showing some courtesy by using some punctuation? Parsing what you text from your phone is a pain in the azz.