Don't think I have enough posts yet to show any pics, but sure I can talk some about it.
Just got her not long ago, 1986 K20 Suburban Silverado. About a 4" lift (I believe) with 17" Fuel wheels and 37" ProComp tires. Only thing stock on the motor is the block, previous owner went through Everything: bored .30 over (355), port matched vortec heads, forged rotating assembly, COMP cam, roller rockers, aluminum intake, 650 carb... plenty more. Behind that an NV4500 out of a '99 8.1L 1 ton with 12" clutch. That overdrive is a life saver, and I swear she likes the highway better than back roads sometimes. She cruises 70-80... even up to 90 and just purrs. Be nice to her and she'll get over 16mpg even. Hard to believe it at first, but GPS doesn't lie.
Rear end is 14 bolt with Detroit TruTrac and front has hardened shafts in a Dana 44 I believe. Has a 208 xfer case, would prefer the gears of a 205, but I'm not hard on her when in 4x4 anyway. Future upgrade maybe.
All in all, a pretty clean truck. Never was the biggest fan of square bodies, but one look at her, work well done by previous owner and well taken care of: garaged, correct fluid changes, clean, little rust (for a square body), I was sold.