Welcome. I like your truck! Good luck with everything. I have a 84 K10 that was blessed by the po with camo. Lol. Paint is last on my todo list though.
I agree, and the drag link has an angle that looks to be 4" or so of lift. The flatness of the springs threw me off though. I have 3" lift TC EZR and there is a definite arch. I'll try to get a pic later, raining out there now.
Welcome, and that's a nice rig. Get you a free LMC catalog to get an idea of the stuff available for your truck. Their are many vendors but LMC has a good break down of things. Then shop around.
On my 84K10 the weather strip on the backside of the kick panel passenger side had deteriorated and was allowing water into the cab through the vent opening. I replaced it with some high quality stripping and sealed it up. Hasn't leaked in two years.