People level their trucks so they don't tear off the front air dam when crossing a creek and so they can add A/T tires and change the stance so it does not look like and old man's truck. Plenty of good reasons to level a truck. Now to answers the OP's question see if the Bilstein 5100 series has something for you. SDTrucksprings is a good source.

‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500