I agree with the information given by Certified Structure Inspector, Home Inspector, Reno, NV .
Be sure you have a home inspector that covers all the items mentioned by Certified Stucture Inspector.
You probably will have to get more thorough, detailed, inspections done by licensed electricians, hvac people and plumbers, and in Dallas, probably a structural engineer.
Make sure the roof, beams, and its stucture is also checked thoroughly.
Love older homes. Which neighborhood are you studying?
RE/MAX Premier Group