My house is over 200 years old and timber framed. The South wall (exterior wall) of the living room drops a couple inches from the front of the house to the back, with the low spot being in the middle of the exterior wall just before the partition between the LR and kitchen. I'd like to jack it as close to level as possible, but with 200-year-old 6 by 8s and joists that are mortised and pegged into the main beams, I'm a bit nervous that something will fail under the strain of being jacked. Anyone experienced with this? I was a professional carpenter for 15 years but I've never tried anything like this before.