70 Duster window's

I need help guy's---I restored a 70 Duster the last 3 years and got to drive it a few months this last year,One thing that i have a major problem is with the side window's,They crank like your lifting 600 lbs and don't seal very good around the window opening,I did put new glass in from A.M.D in both windows and have had a few guy's from here help me with the adjustments and could never get them right,SO when I get the car out of storage in spring this is one thing I want to address and don't know where to go. Anyone here from the Midwest I live in wis. and would drive the car to someone that can help. I think someone here told me that there is no parts available for a-body door windows Looking for help,If I would go with electric openers would that solve my problem???? Searching for help--Steve Thanks