since when do flat cuda hoods cost more than performance hoods?

[360 'CUDA]

Would this be the case with the performance hood as well?

Yes
All of the hoods had the little changes done at the same time

[360 'CUDA]

Here is a list that I posted last year on the subject


As far as I can tell there are 3 different hoods from 1970 to 1974 on Barracudas
1- No holes for Plymouth emblem and no crumple zones -early 1970
2- No holes for Plymouth emblem with crumple zones ---later  1970
3- Holes for Plymouth emblem with crumple zones  all 1971 to 1974

Keep in mind those emblem holes are stamped into the metal top and bottom and would be really hard to reproduce on a '70 hood and the little changes happened to all of the hoods weather they be Shaker, rallye or flat