You might sit a bit shorter in the front with the spring under springs in the rear. IMO the front makes most of the different with the articulation thats needed. So why not just wait till you can afford to do both at the same time then do the whole project at once so the jeeps isnt down for the count and under the knife twice?
Wheel - Wreck - Wrench - Repeat!
The VIN says its a 79 CJ