94 is top down. Spray the nuts from under a few days in a row. More small items that you will find out once removing. Fuel pipe has connections that can be tedious. Ground lines for the lights, trailer package. Removing rear light assemblies helps. I removed my bumper and hitch assembly. Far easier to remove the bed. I have a CC Duelie so 4 other guys helped. 4 because there is always something still attached to the bed (Did I forget the diff axle vent or not?). Good chance to replace fuel lines (rubber), fuel pump, etc. Have the means to upgrade the exhaust system - best time now if a DIY project.
Luck
1994 K2500 ext cab. Recently repowered with; Non-cracked 599 block, factory compression, used old DSG girdle for main caps. Factory for what remains. Changed diffs to 3.42. Fuel economy Hwy 22.5 mpg US, in town without lcokup in 2nd/3rd - 18 mpg US.
1994 K3500 CC LB Silverado. Next project. Built for endurance, power and gearing. Plan on opened up intake and exhaust sytem, best cooling mods, 4.11 gearing 4L80E, followed by Gear Vendors OD. Need to be able to split all gears and have lockup in 2nd/3rd/4th. Tan interior cloth, Bad ass dark blue (coming) aluminum wheels and air ride (coming)