We had Sidewinder Expanded Acquisition Mode (SEAM) around then in the F-4 - but IIRC, the SHAR was supposed to be able to slave the missile seeker heads towards the target using Blue Fox?
Weren't pretty well all South Atlantic air-to-air missile kills achieved visually though?
Incidentally, whatever people might think about him in later years, it's clear that Sharkey and 801 Sqn were far more knowledgeable about the use of Blue Fox and the associated tactics than were their 800 Sqn colleagues...