I don't think you'll be oversprung and bottoming out, but you'll be outside of the normal usable range. That's the benefit of the billy sport is that its a shorter shock to begin with, so its sitting closer to the middle of its usable range, whereas yours is towards the bottom of its. Only drawback to this is that the shocks will wear out faster, since they're having to work harder than their supposed to. That being said, I'd run these until they wear out and then save up for billy sports, its what I did w/ my ireland's on some cheap shocks until they wore out.