[Old Crow]

Go to the Vintage Air web site. Find the number of the kit you'll be using. You can then download and print the instruction sheets straight from their web site. That way you'll be able to see what you may have to deal with ahead of time.
If your '57 has the radiator behind the core support and the X brace in front like a '58, the instructions call for removing the X brace and mounting the condenser to the front of the radiator support.