lowering springs for front and rear

[70MOODY]

Steve here and haven't been around in a while. I've been enjoying my HD Streetglide but I really miss my old truck. I have a '70 C10 named "MOODY" that my Grandfather purchased new and it's been mine now for 10 years. I originally patched it up so I could drive it for a couple of years and now it's sitting again. I want to begin with the suspension rebuild and my question to all of you is about lowering springs. I want Moody to be level with the fenders just above the tires. Moody will be powered by an iron head 454 / Turbo 350 combo with a 3:07 geared 12 bolt rear. Previous engine made 540 lb ft and 475 HP. Please make any suggestions on springs...pics and links would be good too...THANKS