When it comes to looks of the cars the main difference is in the taillights, sunvisors, license plate light and overriders. They built them in 56 with beehives, and the sunvisors were the acrylic kind not the soft upholstery kind you see after 56, and if you had overrider tubes the back one was one single bar all the way across the back instead of the two bar you usually see on replicas. They also had the "shine down license plate light" most likely because of the single bar tube.
Of course there were mechanical changes during this transition, but I thankfully don't have any of the original mechanicals. So its purely the look I'm going after with the above mentioned items so when it comes to the look of the car it is most like a 56.
Inside they had some cars that came with the center ashtray, in 57 and later they had the ashtray option below the radio. But this was not on all the cars, and I'm leaving that out so that I can put the optional clock in that position and have it hooked up to the battery for the power and it will be lighted. The only other way that the clock was done, was to put in a battery operated no backlight clock in the center of the glovebox. I don't like this look as well and I don't like the fact that you can't have it light up so this is what I'm left with.
The car is going to be Black with GM Ivory interior.