1970 dart Unibody critical frame dimensions

I'm looking for a frame diagram for a 1970 dart showing all the unibody frame measurements from factory. I have a severely rusted out sublime green 1970 dart swinger 340 4-speed. I have had the car since the mid 70's. I am the second owner. It's all number matching with the build sheet. I am thinking of bringing her back to life but need to be sure of the specs for the unibody with all the sections that need replaced. I'm located in southwest Pa.
Any info or advice would be greatly appreciated. Thanks!!!