If it is as original as you say, please, please don't do anything to alter the car. Anything you do or spend could be counterproductive and actually hurt the value. You may wind up getting less out of the car after it's cleaned or fluffed, even if it has already been repainted.
I can't tell you how many cars have been busted from Survivor or Bow Tie because they've been cleaned up too much. That's not to say that folks don't restore a car after it's received either originality award if it's just in poor shape. Try to have it judged as is, even if it needs to be pushed in. Don't wory about a score, bring it to an NCRS event to have it evaluated in it's current condition. You'll be glad as it will be appreciated for what it is.