You have to understand that those cars had a team of engineers changing things all the time. One of the most changes done were those hoods. That scoop design in that pic is just one of many. The Mopar chassis book has a "stick figure" drawing of it but it's not much help.
The best you could do is duplicate it though pictures, make a diagram and get busy with the sheet metal brake and rollers. Then you might see another pic of the car with a different design that you like better.
The last thing about those guys is they had all kinds of baffles ect inside their scoops so you might make one that looks the same but never one that performs as well
