Take the window regulator out first then put the window already in the frame set it in the bottom then bolt regulator up and then lift the frame into place on the regulator. When you have the regulator out this is a good time to replace bad rollers.
Dear sir I’m desperately trying to find the two channels for the left and right 1/4 windows the small ones that bolt to the inside rear of window part c if you look at on paper 1964 nova hardtop much thanks
You should start a conversation on the "Wanted" page and if possible, include a photo of what you are looking for. This is not the place to post a "I am trying to find". Also welcome to SNS. Follow the rules and you'll be very happy you joined.