Welcome to the site. I'm still involved with the Chevelle and Elcamino club of Oregon and currently the show chairman for the show in July. Been where you are at before and live in the Tigard area. Windows can be adjusted so the don't hit up on top. Most likely the stops are not adjusted correctly and sounds like you need a new set of shock in the back. Should be able to answer any questions you might have. Looks like a solid car.
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Ray
1970 SS Chevelle Van Nuys Built
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