>>2679743You want Portra. Ektar is too modern looking of an emulsion. If you can get your hands on some Portra 400NC you're set (pic related). For black and white I'd try Acros or Tri-x stand developed in Rodinal. Nice, silky smooth tones.
What kind of Hassy do you have? Unless you have a 2000 series, the 1/500th max shutter speed won't be enough to slow action in most situations so you'll have to get your panning game on. I also find composing car photos in the square format to be pretty awkward. You always wind up with so much room at the top, bottom, or both.