Shock fully extended is only 19" center eye to center eye. I remember rear shocks needing to be at least 24" fully extended in order to work properly with SS springs.
My springs were bought directly from Mancini as they told me their springs were made here in the states under the original specs of the Chrysler SS springs of yore. I know, I'd never try and run Mexico leafs.
These are Strange shocks now. Today, the lady there told me that leaf springs are all the same. That is when I said I'd wait for the original cat returns from vacation that sold them to me. It was looking to be a heated debate between me and her. At last, she admitted that there was something strange about that Strange shock because it calls for at least 22-3/4 fully extended. This is my first attempt to working with adjustable shocks in the rear. Calvert 90/10 up front.