I am trying to figure out what the original ride height was for a 1975 Valiant. The car is sitting on a level floor. I put a level on the threshold of the door and it is a full bubble off. The front of the car is sitting higher than the back. Is that how it is supposed to sit? I'm installing the rearend and the perches need to be welded into place. Can the ride height be adjusted after the new rearend Is installed, or should the ride height be adjusted first? What is involved in adjusting the ride height?