Considering the Vulcan was a Cold War Nuclear bomber, if it had been carrying its 'normal' cargo of instant sunshine, I don't think that not hitting the runway with 2 iron bombs would have made much difference to the destruction caused.
However, it was 1940's analogue driven technology, and even if it made no difference to the Argentine war effort, it certainly gave the British a lift.
And a bloody good beer call on the airfield when '607 returned.
ZH875 (see off crew for XM598 Black Buck 1)