All Spitfires were with carbs. The manouver to avoid neg G cut out is to roll on your back and pull the stick to enter a dive thus preserving positive G.
A stop gap "fix" to the neg G cut out came in March 1941 with the fitting of the famous "Miss Shillings orifice" developed by Miss Tilly Shilling this was superseded by true negative G carbs fitted from 1943 onwards.
Its worth remembering that the performance of the Spitfire versus German fighters was more remarkable if you consider the size of the merlin engine . At "only 27 lts" its a far smaller engine than contempory German fighters engines. Think of it as a 1.6 carb engined sports car racing against a 2.0 fuel injected sports car. The 2.0 ltr may be faster on the straights but you should be able to outdo him in the corners.
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