My experience is with a 1972 4/4, removal on this car is possible from underneath.
You do need to get the front high, but my trolley jack and axle stands will get the car high enough. On that age of car, there is a tie bar that holds the tops of the inner wings, and undoing it and removal of the metal box at the bottom of the radiator and front of the car will enable this.
If I was doing it in a garage, I'd pop the car on a post hoist.
