The 6.98 out of a Boxer is miles too bulky and heavy. A 4.98 out of a Leyland tractor would perhaps be size and mass suitable but probably underpowered.
The Turner would be a bit puddy also. I remember helping a mate change one out of a Commer knocker roadside. We were both young, fit, and 14+ stone and it took the best efforts of the two of us combined to lift the Turner box. We used two fanbelts as slings and stood on the chassis rails to lift it back in.

