Keep in mind if you do buy a different one and if you want to keep it completely stock, the date code on the radiator will be an issue. You could probably get away with a late 56 model (K, L, or M) to pass for a "quick glance" authenticity. If you are going to Hot Rod it, I imagine the date code issue won't matter much to you. Good luck with the '57

Cheers,
Firechicken