Hello orca,
I will try to answer some of the questions.
The Vulcan was not considered in the very early air defense plan. The main threat then were the SHARs and
"Sea King helicopters armed with Martel missiles" (yes...); also C-130 operating from ASI (and diverting to Punta Arenas) were in the defense plan. But not Vulcans.
The main objetives to protect (in the Central CODAZ area) were: 1) Airbases, 2) Balcarce satellite station, 3) Puerto Belgrano Naval Base and 4) Oil refineries, specially in La Plata area.
There were three radar sites (including the one at EZE airport). To be clear:
From mid-April, the Vulcan was considered as a possible threat, as intelligence (and Ivan) suggested. But, even 607 was detected 425 north of the islands by the TPS-43 radar on May 1st, 1982 (and then faded), no action was taken then: the Vulcan was just another scenario to cover.
BB1 changed all the equation as the Vulcan threat materialized. Mainland attacks were considered and, on ocassions, A/C were dispersed due to intelligence warnings.
Here, a FLASH traffic, intelligence informed
"sixty percent chances of Vulcan attack to the mainland and more chances to attack to the islands", giving instructions to active the QRA.
Obviously, A/C were retained for QRA duties (five minutes warning, 24 hours defense), not only in the south, but in the central (CODAZ) defense area.
I am in the correct path to answer?
Regards!