I didn't enter to this, because I have not even a clue what sort of cars there were in the 50's in America, but if I have some time and I have a good idea in the future I will enter in the next contests.
1. canarycny- I like it! It quite realistic and could go in production
2. ACcartoons- It's a close second, because I think you have done a great job to change the whole car! But it doesn't look very realistic, but keep the good work up!
3. davidesign- It's a good 3rd but I don't like the colors and the front bumper doesn't fit to the styling of the rest of the car.
Rm.Design - Automotive illustrator