1970 Dodge Dart Dash Removal

First thing I would do is verify that the windshield is sealed good. If it is, I would really hate to disturb it. If it leaks, take it out, then the dash. Do everything possible under there (wiper seals/ heater box...and then put it back. I know the dash can be taken out from the inside, but sounds like a lot of work to inspect wiring.