426 Hemi into a 67 68 or 9 Notchback Cuda

I would not worry about that Dart, no offense to the OP but that sounds like a bullshit story. No one would scrap a Hemi Dart even if it burnt to the ground I would keep it for yard art.
Lmao, so with your great knowledge how many original bodies(Dart or Barracuda) are around and if just one is missing your opinion is more than bullshit, it's irrelevant. What you "would've" done back then is just a pipe dream.

Example from 2015
"In 1969 Hall of Fame racer Max Hurley took possession of his 68 Hurst Hemi 426 SS/AA Dodge Dart and raced it all around the south until he sold it to Johnny Burge of Mobile, Alabama and two of his buddies ( Charlie McLemore & Howard Blackwell ) in 1976. It was raced at tracks around the South and Johnny also street raced that car until 1979 when it was damaged in an awful accident. Parts were saved and the car was crushed as were most of these old cars back then. Johnny wanted to bring his old car back to life so he started again. Many years later what you see here is the result of all his, his loving family, and many others hard work."