need help on a charity build !!!!!!!!!!!

OK today I get the scamp title in the mail and it says it is a 73. Run the vin.sure **** it is a 73 . When I got the car I thought it was a 71 . I was told 71. Now how screwed am I on body parts coming .Are they close? Being a bow-tie guy I know very little on the mopar interchangabilty. So now I am in A whole new world of stress ! Any help would be great. Started mocking the straight axle tonight and will have to get pics out. It looks cool !! But now I am wondering how screwed I am with body panels.