It was M61 compatible in several variants but I never saw one with a cannon in two deployments.
For the F-111 defensive meant light both burners and head for the deck. I don't think short of a B-1 that anything could hang low and fast with them for long.
Saw HUD footage from an F/A-18 on the Fallon range once, he rolled and pulled down onto the F-111 who tapped burner and by the time the Hornet was even close the 111 had 500 kts of airspeed on the Hornet and egressing out of range.
During Desert Storm an EF-111 got jumped by an Iraqi Mig-29. The pilot selected "hard ride" on the autopilot and 200' and the 29 flew into the ground trying to convert on them. Air Force, who hates tactical EW, didn't give them a kill.
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