If the rear is the culprit, you can put a spacer between the rear's spring mount pad and the spring..... A metal disc/washer a couple of inches in diameter.
Might be best to take the springs out and compare side-to-side. If there's a noticeable difference in free height, call Espo and see if they'll exchange them.
I put some Moogs on the rear of my red '66 and it was uneven. Installed spacers to level it out.