Bottom line: The Cuda Performance Hood (J54)
outer skin remained the same from 1970 to 1974 except for minor differences with holes for emblems.
The only exterior differences involved holes on the scoops for the engine callout or a front emblem denoting "PLYMOUTH".
1970 & 1971 Cuda (BS) models had hood scoop holes for either `cuda 340, `cuda 383, `cuda 440, `cuda 440-6 or hemicuda.
The 1970 Barracuda (BH) models could be optioned with the Cuda Performance Hood (J54) beginning in late-November 1969. Hood pins (J45) were mandatory with J54 in 1970. Hoods optioned for BH models did not receive the `cuda hood emblems since they were not actually Cudas and the scoops would not have holes punched for emblems.
The 1971 hood gained the "PLYMOUTH" emblem in front of the driver's side hood pin.
1972 & 1973 Cuda models could be had with a 318 and no hood emblem or a 340 with `cuda 340 emblems. 1972 was the last year for Hood Pins (J45).
1974 Cuda models could be had with a 318 and no hood emblem or a 360 with `cuda 360 emblems.