It is a JH car, originally 318. I did check the frame rails in the rear, they seemed solid, one thats shown in the pic did have a dent in it. The original tach does still work, I don't know why he put the other in. I know the engine isn't original, they didn't put 400s in Challengers did they? I don't care if its all original, at this point I couldn't go back, too much stuff has been taken out over the years, so I can fix it up the way I want. Thanks for all your input, I will probably buy it. I know its gonna take a lot of time & money, but its gonna be a long term project & it should be worth it in the end.