It's good advice to remove the radiator when pulling the engine from an AD (and maybe the others). In the old days, they made things even easier by cutting the radiator frames on ADs.
My '48 has been cut a few times and they didn't even weld it back the last time!
Radiator Frame Cuts. I brought my '48 to an old-time mechanic and he said "Yea. That's the way we did it!"
Of the 31 AD carcasses that were once in a local junkyard, about half of the frames that were still there had been cut.
Has your radiator frame been cut?