RE: Chrysler Historical?
The 1970 Challenger hood does exactly what you have found. That is why they changed the design of the hood crumple features for 1971 on. I believe that the repro hoods that are available have this upgrade and are correct for 71 thru 74 Challengers. They will work on 70 Challengers though. I have a friend that works for Chrysler as a Crash Test Engineer and he has told me that they do not have records that far back.
Bob