Coronet, yep. If you watched the Barrett-Jackson auction, they auctioned one off just like this but 4 door. They said (sat.) there were three 4 doors built, and one even more rare which is a 2 door, and there is only one built. This is it.
426 Hemi, factory lightweight. 300 original miles. In the documentation with the car, it says it is for accelleration tests only, and can only be run for 7 minutes at a time. Came with factory aluminum heads, 538 gears, reverse manual valve body, etc.