it needs 2 lower quarter patches and front and rear floors, and trunk. the frame and inner fenders are super solid, roof ect.
if you have the parts time and equipment to fix those problems you have a nice base for a car. IF you are going to run under 10sec they will throw you off the track without a cage, so plan for that while you are welding. Also if you are putting down the power for a 10 or 9 second car it wont hook without nice slicks 12" or so and you cant do that without tubbs. So plan on that when you have the welder goin also. And sub frame connectors as well.
I think those are your plans that's why i'm sayin.
as it sits it's worth $1000. with perfect body probably 7k. if it's a running 340 those are worth somethin as well. (they are valuable especially to someone doing a factory restore that needs your specific block. where did the '71 challenger go, you should track down the owner)
not a bad find, especially if it's local to you