Have not removed mine yet, but here is how i am told by the helpfull Daves1940Buick56S:
If you want to pull the radiator the hood has to come off. The hood's a little dynamic once loose so it's best to do with 3 people, one on the front. The grille does not have to come off. The top piece over the radiator is part of the shell and front clip and does not come off. To remove the radiator, pull the water pump and remove the hood. Then take out the bolts holding the radiator on to the shell and lift up and back towards the top of the engine. It takes 2 people although I have been told that back in the day 1 mechanic with a strong back could do it standing on the front bumper.
Bars Leak radiator fix!