No.
with the exception of the bumpers & bumper brackets they are identical
A 1972 front bumper will not directly fit a 1973 Nova without modifications. While the two models share a similar design, the bumper mounting brackets and alignment may differ due to changes in the body structure and design. It's advisable to check compatibility or consider using the correct bumper for the specific model year for the best fit and appearance.
About 20 years.
No, the brackets & everything are different since the body changed that year. The 73 has that wide strip between bumper & body so the curved sides longer to take up the gap. I think wheelbase also changed slightly. The 73/4 are the same.
Yes, they are.
No
Yes.
I used brackets from 72 nova did a little cutting and they worked.
Yes it will bolt right on.
Not without modification. The 1973 and 1974 body styles are unique in the Nova series.
Looking at the bumper, you will see raised, chrome, dome shaped, bumps. These are actually bolts, with a nut on the back sides. Then, it will just lift off.
need to know 1y27k3w277898 vin for 1973 nova