cut the complete front off and the rear with springs
If the alignment holes are there at the back of the inner fenders do not mess with them
remove the windsheild and Take the complete dash out
.You need to take as much off that shell.from the rear seat forward as possible. You will be putting the doors back on
Take measurements from the rear rails forward . Sides and hump to place the torsion cross properly. That will be the first part that will need to be replaced after fixing the rockers.
Its ashame we just scrapped a rust free notch for the clip for a fast back. I have had them here just as bad and they left perfect. We are now building a fixture as seen below from a perfect 108 body to fix twisted drag cars and rotted ones. But we have done many like this without the stand.
The best thing you can do is make a square and level perimeter stand out of heavy steel angle or beams to set the rockers on and strap weld it in place after you refit the doors and square the openings. Physically seeing the car would be the only way to advise you what needs to be done. there are many bodies out there that are available with far less rust .
Why do you want to save this car? Would be the first thing I would think about. That body has no numbers that are usable. These notch rear bodies are out there . we discard them to fix fastbacks when the customer brings the cars. Don't jump into something that is over your head. Once you start you are commited.
Look at the under side of the cowl I believe you will find it needs one.
Make a perimeter table with attachment fixtures is the first thing to do. Or take it to someone who has one
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