Such an EB rookie question...

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I'm with Chuck - most everything can be done with the body on. We swapped a C4 into my wife's EB to replace the 3 spd with the body on and no body lift. Yea, those hard to get to bolts on the bellhousing are tougher when it's on but no problem.

Fuel lines and brake lines are good to get done first. I ran mine on top of the frame rail instead of the side and attached it with adel clamps.

I rewired my wife's with the body on - in fact I think the body needs to be on for this. You don't want to risk pinching a wire or something while putting the body on and a lot of your grounds go to the body also.

I would have your motor and as much of the drivetrain together as you can but remember that everything you put on it prior to is something else that you have to lift over when you put the tub on - not a big deal if you have a fancy hoist set-up but can get tricky when it's 3 or 4 guys lifting it up and on. t-case bolts are a good example - a PITA to do with the body on but a trick to lift up and over and line up in that small hole in the tunnel.