I suspect the anti-roll bar. Especially the flexible bushing(s):
(https://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Alfetta_front_suspension_antiroll.jpg/220px-Alfetta_front_suspension_antiroll.jpg)
(https://www.amcarparts.co.uk/water.php?img=antirollbar_24.jpg&type=pro_de)
I suspect the anti-roll bar. Especially the flexible bushing(s):
(https://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Alfetta_front_suspension_antiroll.jpg/220px-Alfetta_front_suspension_antiroll.jpg)
(https://www.amcarparts.co.uk/water.php?img=antirollbar_24.jpg&type=pro_de)
I had a look at the anti-roll bar but couldn't see anything wrong with it myself - although I'm no mechanic.
Here's a photo of it. Excuse the transmission fluid leak, that was a separate issue from the drive shaft seal.
(https://i.ibb.co/R7r76kD/IMG-0729.jpg)