I have added a few shots of the underside. Body is solid with no visible rust. I honestly do not know what work was done to the drive train before I purchased the car. I purchased it running and driving. I have replaced the wiring harness front to back, new intake and carb, added 90 degree oil filter adapter, new tires, billet HEI distributor , replaced ball joints and tie rod ends, and new electric fuel pump. The previous owner said the engine had a small cam (purple shaft) but was stock other than that. He also said he removed the 3.91 gear and replaced it with the 3.23 for highway driving. He did not have the original gear to go with the car. Thanks for everyone's help.