As the owner of a '64CS since 1975, I am quite certain that a hood from any model of a '64 Strato Chief, Laurentian, or Parisienne will fit your CS. There are other differences, but, to the best of my knowledge, the hoods are all the same. If not, I have no doubt that someone will soon correct me. Good luck with your project. PM me if you have any further questions. I would be interested to see some pictures of your project.
There is a nice hood at Creative Recycling in Timmins on a 64 Pariesienne. Dark blue in colour. Check out his website for pics and yard inventory. Owners name is Jim tell him Al Taylor sent you there. I can post his cell number tomorrow as it is in my shop.
'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.