Stock shrouds are 2-piece sheet metal, I think, and as-stated only on some models and very rare today since most corroded or were tossed. On my 65 Dart w/ 273, I have a copper square-top radiator for a ~72 Dart that I think is for a slant (1.5" lower hose), bought at Autozone. I have a later plastic shroud which I recall buying on ebay. But, this only works since I changed to the later aluminum water pump, but would fit your slant. Don't recall if I had to drill mounting holes in the radiator flange.