dash questions

The dashes are different from 69 to 70, the key moved from the dash to the column in 70 so the wiring is going to be different between the two.
You can get the dash out without pulling the windshield. There are 5 screws that are hidden under the windshield gasket that cant be accessed while the glass is in place. You'll have to cut "U" nuts off from the bottom and push whats left of the screw up and out of the dash. Then it's just two bolts above the kick panels, one bolt by the column, disconnect any wiring, heater controls, vacuum lines, pull the steering column out, etc... and the dash should just pull right out as long as there a bunch of butyl spilled on it from windshield installation.