What years of challengers sheet metal fit up to my 70?

I have began my search for a metal shell that would be easier and cheeper to just swap panels such as floors, frame rails, and firewall, even if some repair will be needed on the metal afer the swap that's ok as long as it's not as bad as my car is at the moment. As you can see, i'm trying to avoid high cost of all reproduction panels even if a bit more work is involved. Being young means money is VERY limited and this is why, and resources and help are much more plentifull than money. So i need to know what years i can look for that the metal will be identical to mine.

Also things like fenders and tail light panel (some of the things i thought were changed through the years) are fine, so i just need a metal SHELL. Thanks moparts

For correctness, you are unfortunatley pretty hosed on by any year other than 70. There were numerous changes from 70 to 71, and certainly from 70 to 72 and later. For example, the floor pans on a 70 are welded in differently on 72 and later. You can use the later stuff, but it may not fit right. Firewall should work, cowl will work, but there are differences on how the screens and ballast resistor mount. A-pillar, and stuctural stuff will work, but there are changes between 70 and other years. Some of the 70 brackets may need to be saved (I am thinking exhaust and emergency cable brackets for example). I used a 72 for a-pillars, front frame rails, cross member and roof skin for my 70. I will also use the 72 cowl ends to repair the 70 cowl. If I had to do it over, I would probably just sold the 72 and bought the reproduction. But back when I started this, I didn't know they would have all of the metal they have now.

Agree with the above. If your really being picky, the 70 floor pans have a very specific rib pattern that is different than all other years. The AMD replacement pans use the 71 ribs, just so ya know. Finding original 70 metal will be a Challenge (no pun intended)!

It's ok. I now atleast know I should "try" to get a 70 shell. But other years will work, just not as good or easy of a fit. Which I can understand. If it's a must I will get some metal from amd, but then I might end up spending more money for a shell and some reproduction metal...but if I lad on the right shell (hopefully at Carlisle) I will take it over buying new/expensive metal...I figure I will have around or maybe over $2,000 in new repro metal (probably more), but if I can pick up a decent shell for $1,500, I'm in....kinda understand a little better?

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but if I can pick up a decent shell for $1,500, I'm in....kinda understand a little better?

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Oops...you forgot a zero.... A decent 100% rust-free 70 Challenger shell use to sell for closer to $15,000 then $1,500....Nowadays, they're a bit cheaper, but still over $5,000 for sure.
For $1,500 you will most likely find only stuff that's worse then what you have.