The car thats in the movie is a 1973 trans am--firebird conversion with a 400 ci motor and mufflers removed,it's NOT A 1974.
The front of the 1974's were slanted backwards and did not have ovalscoops that come to a point in the nose like the 1973's.The car couldnt have been a 1974 because the movie came out in 1974 and they had to have traveled forward in time to get a 1974 T/A to make the movie in late 1972 to mid 1973.
It is a Great Movie for all car lovers....Pilgrim!