AMD Challenger hood, 1971 crush-zone only. Has 'Cuda like under brace.
AMD Cuda hood, 1970 non-crush zone only.
Both have smaller and more, spot-welds.
If you want a repro hood to be close to exact, get a Harms/Restorick under hood brace and a BEA Trim ring ('Cuda only) and find a real flat hood. Make the spot welds wide and shallow.