Thanks guys,I didn't think to much about the car being in a twist or anything being disassembled. I am going to wait until I have it done before the ties!!
Yeah...these things twist REAL easy! The link below not only shows you how to make a pair of frame rail connectors, but how to install them. Although it's not mentioned, you can see in the photographs that the car is supported on jack stands for the installation. In a recent issue of either Mopar Muscle or Mopar Action they did an install where they mentioned leveling the car using a bubble level before doing any welding.
I'm waiting until my car is assembled and driving before I install my sub frame connectors.