65 Valiant swap 273 to a 360

Is there a difference in 360 water pumps? The 360 that I'm using came out of a motor home and the snout is longer than the one on the 273. I'm guessing that a car water pump would be different? If that is the case what year/model car would be the best one to order? The Valiant doesn't have AC, or power steering if that makes a difference. Too bad the 273 timing chain cover and water pump won't swap onto the 360! Thanks, Litz