Spit VII, ( clipped wing), carb issues.

[Black Hornet]

Manoeuvrability Spitifre XII ,( clipped wing).

The general manoeuvrability for dog-fighting is slightly limited by the fact that the engine cuts under negative acceleration forces.
http://www.spitfireperformance.com/spit12afdu.html


The Griffon III engine has two speed manually operated superchargers, giving full throttle heights at about 6,000 feet and 18,000 feet. It is fitted with a standard Claudel Hobsen carburettor and cuts fairly easily under negative acceleration forces.


http://www.historyofwar.org/articles/weapons_spitfire_mkVII.html

The Mk VII remained in production from August 1942 until early in 1944




One can see why the MK 9 was the most popular version.

[Gromit]

MkXII was developed as a low level fighter to combat the hit and run attacks on the southern coast.
Early MkXII used the Hobsen Carb as did early MkV, later aircraft used the Rolls Royce/Bendix injection carb as used on the MkIX, the carb was specifically designed to prevent the neg G cutout-
http://www.spitfireperformance.com/spitfire-XII.html  noted here under engine data

[Black Hornet]

Yah, direct injection better.