Hi Nigel,
To help with identifying the gear setup, gearboxes made for the reverse camplate have two positions for the index plunger, top and bottom,
STD boxes only have one hole at the bottom
If the plunger is in the bottom hole then it has the standard camplate, (lever forward,1 up 3 down)
Plunger in the top hole in the gearbox is for reverse pattern camplate (lever facing back, 1 up 3 down)
Any other permutations have been the efforts of previous owners (bodgers!)
This information is from my own experiences with the gearboxes that I have worked on
HTH
John O R