certainly can be. Like Anthony said, longer shackle is better for deavers that have more travel. too long isnt really an issue other than space and the spring pack angle/pinion angle change it can cause.
OK thanks guys, and would that setup be level with the front of my truck when I loosen the torsion key bolts all the way? My truck currently has a 6" rcx lift and seems to be 5" blocks with an add a leaf as well.