how is the 73-4 beak different from the 75-6 ?
It's not! The only difference was the chrome trim used on it. The '73-'74 has a plain chrome trim strip across the front while '75-'76 had a taller version with DODGE stamped in it.
And the brackets that the grille screws to. Park light area is more recessed on 75-76, therefore brackets are farther back. You can put a 73-74 grille in a 75-76 header and just not use all the screws, but to put a 75-76 grille in a 73-74 header, you need to cut the brackets off the header panel and still not use all the screws.It's not! The only difference was the chrome trim used on it. The '73-'74 has a plain chrome trim strip across the front while '75-'76 had a taller version with DODGE stamped in it.
Do you have better pictures so the people can see the front of it(emblem)? Also any pics of the underside(to check for rust)