Never used a mopar drop spindle before, but I have on other makes and the biggest issue I found was the tie rod ends contacting the backside of the rims if you run a 14" or 15" wheel. A drop spindle moves the wheels up while the rest of the steering and suspension parts remain in their original locations. Sometimes there are no issues and other times you may have to grind stuff to clear or buy new wheels, ect.

My current setup is so tight that I can't run wheel weights on the inside of the wheels becuase the tie rod ends will rub and peel them off. This is on a chevy pickup, so your car may not have the same issue, but that would be the first place I'd look at.