On my '53 5-window I only had leaks on windshield after new glass was installed.
I had a local glass shop inject black urethane up under the rubber from the outside and $300 later, the problem is cured -- almost. In heavy, driving rain I will still get a drop or two easing through at the bottom of the centre windshield divider.

But going through a touchless car wash my one and only time ;-) was like a great old comedy episode of I Love Lucy. I couldn't keep up with the leaks blasting in from the side windows and vents. I was laughing so hard at my own stupidity and I couldn't pull out until the rinse cycle was complete!