I have 71 doors on my car which should be the same, and they do indeed have a crash bar the full length about 1/2 way up. I can't imagine how you could cut them out without either damaging the door skin or slicing your arms open trying to work through the small access holes.
There is no relationship between the crash bar and the window regulator; I can't see any issues with the glass fitting or operating without that bar.
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Michael

1970 Oshawa built 1 option Judge. 24 year restoration/upgrade project finally finished!
1979 Trans Am - low-buck drag car project for when I retire
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