Window Motor Swap

I'll probably be swapping out the window motor this weekend and was wondering, can the old motor be removed without propping up the window with a block or is it currently held up by the window motor gear? If I need a block, how tall? I'm swapping with a Dorman motor for now and will probably rebuild the old motor using one of the methods I read about in the For C or B Bodies only link. Thanks.
Author: dm330