I cannot vouch for authenticity of this car, and other photos reveal some missing/incorrect stuff, but I do see more white here than just the seats and door panels. White quarter trim and pillar trim are obvious. I'm not certain about headliner, but looking thru the windows it appears the headliner is also white. And repro headliners are available in white in the catalogs, if that means anything. And the package shelf? Appears it maybe be white on this particular car. Correct or no? I don't know...
Indeed carpet/dash are obviously black.
I do not claim to be an authority of any type on this originality subject, just an observation that I believe white might need to go beyond just seats and door panels, but I could very well be incorrect.