Congrats on the "new to you" bikes. I kinda like the GS450's too. Not sure what I'd do, probably like others have already said I'd get the "T" model running first, and then goto work on the "E" model.
1989 Kawasaki Ninja 250 - a scottoiler system, Works Performance rear shock, Traxxion Dynamics front forks, Oxford Heaterz heated grips and Handlebar Muffs for when it's really cold. My Mileage Tracker Page