What size tires do you have? I have the 2/4 hotchkis drop and 18" tires. I think I ended up ( measuring in a parking lot) .5" under a stock 2001 1500 on 16" tires. I beleive it was from ground to top of bumper. I love the way my truck handles since I went with the Hotchkis springs and sway bars. On my member page there are picture of my tires and drop if you want to check them out. I am not sure about the other brand but I have a couple of friend with F-bodies that are running them.
1 Handling you be be close to the same height so 1.5" - 2" drop not a big deal so I would say it will come down to the differance in the spring design.
2 not sure but I would think with the less drop the way they are mounted would be differant.
3 don't know.
If you want I will get a picture with a piece of paper or cardboard on the side of the truck if you get me the measurements from the bottom ot quarter panel to bottom of bumper. Hope I help a little
1999 Silverado 1500 Ext. cab Red 2/4 hotchkis drop & swaybars, bilstein stocks, AR626 & 404 Nitto's, Yank converter, ASM headers, ASP underdrive pulley, Taylor wires , free mods VCN 2000, Nelson Performance tuning
2002 Red WS6 M6; Flow master K&N