best way to fix rust around rear window

yea that it is but it's a lot easier to fix less than more. The one thing that has me wanting to fix the one with most of the rust is that I have every piece of documentaion that was ever generated with the car, including the white paper fob that came on the original keys which i have and still start the car to this day. I have a little note pad from 1972 where the original owner started taking notes and even documented her first tank of gas at 35 cents a gallon. I have everything in between also.

Heres the pics of the donor car

Hmmmmm decisions decions.

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