3. FRONT SPRINGS INVERTED WITH ONLY 5MM CLEARANCE TO RUBBER BUMP STOPS
4. NO SHIM ON ONE SIDE OF LEAF SPRING, WITH LOOSE BOLT
Is your truck lowered?
Judging by all that chrome in the engine compartment your truck may have been a show truck at one time. You don’t see very many chrome steering mast/inner fenders.
If you put stock springs on the truck you will have to re align the front end.
the shim your missing might be a caster shim
Check your rear spring against your assembly manual. Number of leafs, routing.
My ½ ton truck has 3 inch (76mm) clearance between the frame and rubber stop. I don’t know what the 3600 should be. Maybe someone will post.