AH HA!! YES of course, the wheels were a little close to the arches.
I guess that's what you get with a 50 year old car, a little bodge here & there which becomes permanent & forgotten about.
Thank you everyone.
While all this is out I'm probably going to remove the rear springs for inspection of the pockets. Yikes!!!! I've seen some scary posts on these, but at the moment everything back there is all covered in thick white paint & it may be hiding something nasty. I'm not looking forward to it.
New axle I have is getting a 3.7 diff " ebay shopping again".