This is not the correct way of measuring ride heights on a Renault 4.
For the front wheels measure the distance from the front wheels to the ground, and from theis figure subtract the distance from the chassis rail to the ground. Difference should be 51mm, if your measurement is greater the vehicle sits lower than normal, if smaller it sits higher.
The same goes for the rear wheels, but you subtract the wheel center-to-ground value from the chassis rail-to-ground one as the chassis is higher than the wheel center. This should be 150mm.
Measurements on the chassis should be taken at the wheel centerline.