Vehicle height

Factory suspension height should be 1 7/8" determined like described in the manual

factoryalignspecs-jpg.jpg

Bumper height is a little easier to measure, you can see that here
The 1970 Hamtramck Registry "Chrysler Passenger Car Bumper Heights 1965 thru 1976" Page

From Hamtramck for a '70
Screen Shot 2021-04-06 at 1.14.15 PM.png

Measured like this...
Screen Shot 2021-04-06 at 1.15.14 PM.png