Parting out one car to save another?

[Nova Jed]

I just recently read the post on that very thing. There is another issue I have regarding that "numbers" swap. Are there hidden numbers in uni-body rear frame rails? I have an original 71 A/C Nova with a bent rear rail and I dont want to throw the car away because the rest of it is in great shape. I read the post about swapping numbers and "rebodied" vs. restored. I am kinda second guessing fixing it after reading that. But what happens when they do finally reproduce the rear frame rails for these cars? UGH! What a mind blowing topic.