no, i don't think they fit. 73 and 74 had larger bumpers and different brakcets as far as i know.

embarracuda, they are defenitely different as in 1973 a government mandate included vehicles to be fitted with front and rear bumpers capable of absorbing a low-speed impact, and both the front and rear bumpers for the Nova were restyled larger and stronger. Unfortunately due to this I do not think that they would fit.