Carter AVS for sale Nice!

Why numbers were ground away ? A good clue is in the long list of numbers that a single rebuild kit covers.
Just one example... 67 273 Commando AFB standard number for automatic transmission build is 4295. C.A.P. number 4305S. The single difference between these 2 carbs is stops at mixture screws that limit their travel in the C.A.P. 4305S.
To force the screws past those stops will damage them. To take the carb completely apart and rebuild it requires properly removing those stops.
So... After the rebuild the carbs were offered for exchange. Customer would balk at mismatched numbers. Solution was too simple.
I guess I should ad There were 2 more numbers for the manual trans build carbs that had slightly different sized jetting. The rebuilders could ignore that aspect of their replacement carb, rebuild and provide whatever they had to work with.