The C6OA-6384-D bellhousings were used on the Fairlane/Comet/Torino/Ranchero/Mustang/Cougar cars. Ford started using the block plate starting in the ‘63 model year for properly locating the starter, so yes you need the plate with that bellhousing. The plates are functionally the same from ‘63-76, and in any given year are the same for both automatic & manual transmissions, and for both cars & pickups. There were running changes periodically in the stampings, as far as the clearance holes punched in them, and the embossing around the crank hole, but functionally they are all the same. Just check for interference around any oil galley plugs on the rear of your block, etc.