How to adjust the 4 headlights on a 1984 GMC k1500

[72timemachine]

I have read many articles here and on the web about aiming headlights. Typically they tell you to back up 25' feet on level ground, so on and so on. The problem is, this person's k1500 is lifted, to a comfortable height, nothing crazy high. A person of average height standing on a milk crate can work comfortably on the engine. I tell you this just to give you an idea of how high the truck is lifted.

So, if anyone knows how to properly adjust all 4 headlights, I would appreciate your help. I have reconditioned all the headlight buckets, greased the 3 contact points for ease of adjustment and replaced all 8 of the aiming screws.

Thank you for any help.