The quarter, fender, replacements are the same, but I know that in the 65 year that the hood lip is different on a chevelle hood and the trim doesn't fit very well, ( the angle is different). The front of the fenders also must be modified, ( the holes for the eye brows are different). You might run into the same problem with the 64 front clip trim. They all bolt up, but the main difference is front trim and the tail lights.