Quite a few of the newer released AMT kits have the hood open "hinges"!
(Not re-releases for obvious reasons)
Both the Edsel and '60 Ford do, as you suggest. Unfortunately neither of those looks anything like current hood hinges so using them on a ’69 Camaro makes no sense.
However… the 1962 Catalina, also from AMT, has perfect hood “hinges†for use on nearly any car through the 80’s.
Trumpeter also jumped on this band wagon of casting open “hingesâ€, which they put in both the Pontiac kits should the photoetch working hinges prove too difficult…. :roll: