best way to fix rust around rear window

Kevin, you should thoroughly check bodies on both cars for rust and damage. Floors, lower doors, fenders, quarters, sub-frames, trunk, etc., anywhere and everywhere. Then compare drivetrains, interiors, options, etc., and then try to make a sensible decision as to which would be best to fix up. To tell you the truth, the donor car you have looks to be in pretty good shape, from looking at the pics. Shame to have to chop it up. Like you said, decisions, decisions. Mike