I'm tired of the window gaps on my '48

[vintage_car]

so I have a 48 chevy/s10 swap. both windows sort of just bang around when they are rolled up. I have cardboard wedging them in the windshield channel so they don't bang around to much. Neither window rolls all the way up, there is a bit of a gap at the very top. there is some gap at the back of the windows too. the window regulators are not new and maybe there is a way to adjust them to close the gap at the top so the window rolls all the way into the top channel? as for the side to side motion of the window just rattling around, is there something that prevents this that might have either rusted off or been removed? The truck has PLENTY of patina on it, so any suggestions to fix the issues would help. It will not be a restored truck, so alternative fixes are okay, but the window must still function.