Assuming the steerer on the new fork is steel, you can use quite a tall spacer stack safely. For carbon steerers I've seen a recommendation of 25 mm max for a 1" steerer and 40mm to 50mm max for a 1-1/8" steerer. An 1-1/8" steel steerer should be able to exceed this with no problems but I wonder if 80mm will make the steering feel a bit flexy.